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Windows Media Builder

Automated preparation of Windows RT 8.1 & Windows 10 Installation Media

Features

Windows Media Builder is available two versions, one for Windows RT 8.1 and one for Windows 10, its purpose is to automate and simplify the creation of USB installation media for Windows RT devices.
Windows RT 8.1 IR5 Media Builder
Windows 10 Build 15035 Media Builder
Mainstream support for Windows RT 8.1 ended January 9, 2018, and extended support for Windows RT 8.1 will end on January 10, 2023.
  • Downloads the latest release of Windows RT 8.1 (IR5).*
  • Downloads Windows Updates.*
  • Integrates Windows Updates with customizable update levels to allow for Jailbreak compatibility.
  • Downloads Office 2013 RT Home & Student Plus Updates and creates update pack.*
  • Downloads Windows Defender Updates and creates an update pack.*
  • Integrates device drivers.
  • Customization of provisioned Apps.
* All downloads are direct from Microsoft, no third party sources are used.
Windows 10 Build 15035 is now five years old and it should not be considered as suitable for daily use, in addition to being outdated it has numerous bugs and other issues expected of an expired pre-release build. Consider running Windows 10 Build 15035 as novelty value only, it will not make any Windows RT device useful.
  • Downloads Windows 10 Build 15035 (English Only).*
  • Downloads Office 2013 RT Home & Student Plus.*
  • Automated installation of Office 2013 RT Home & Student Plus.
  • Customization of provisioned Apps.**
  • Options to remove BitLocker, Cortana & Windows Defender components.
  • Configures Windows & Office activation.
  • Integrates device drivers.
  • Applies common modifications automatically.
* Windows & Office installation files are downloaded from Archive.org, no Microsoft source for these files is available. Office Updates and Language Packs are downloaded directly from Microsoft.
A previously downloaded copy of Windows 10 Build 15035 from Betaarchive or from Archive.org can be placed in the Media Builders \Downloads\Windows folder and the Microsoft Office 2013 RT Home & Student Plus installer from Archive.org can be placed in the Media Builders \Downloads\Office folder to avoid having to download these files again. ** Not all Apps are tested, some may be end-of-life or otherwise unreliable. Auto app update is disabled by default, if the Store is allowed to update to a version newer than that included it will not be able to install new apps from the store.

Device Support

Device
Windows RT 8.1
Windows 10
ASUS VivoTab RT
Dell XPS 10
Lenovo IdeaPad Yoga 11
Microsoft Surface 2
Microsoft Surface RT
Nokia Lumia 2520
Samsung Ativ Tab
Working Untested Non-functional
Working (Requires Yahallo to be applied, Golden Keys must be removed if installed)
Working (Requires removal of Golden Keys if installed, Yahallo is optional)
Working (Requires use of Windows RT 8.1 Recovery Environment Setup Mode)

Requirements

  • An x86 or x64 PC running Windows 10 (1703) or above, Windows Media Builder cannot be run on the device that the image is being created for.
  • At least 48GB available hard drive space on the device Windows Media Builder is being run on.
  • 8GB+ USB Drive.

Download

Download the required version of Windows Media Builder.
Windows RT 8.1 IR5 Media Builder
Windows 10 Build 15035 Media Builder
  • Download - Version 2.4b - 20th November 2022
  • Download - Version 2.4b - 20th November 2022

Extract

Due to path length limitations it is recommended that Windows Media Builder be extracted to a folder in the root of your hard drive, for example:
C:\Windows_XXXXXXXXXX_Media_Builder_vX.Xx\
Windows Media Builder will provide a warning if it is run from a path that is too long.
  1. 1.
    Right click on the downloaded file and select "Extract All..."
  2. 2.
    Select a destination for the extracted files.
  3. 3.
    Click "Extract".
Extracting Windows Media Builder

Building Installation Media

The use of Windows Media Builder or the installation media it produces is entirely at your own risk.

Running Media Builder

  1. 1.
    Open the folder where Windows Media Builder was extracted to.
  2. 2.
    Right click on "Build.cmd" and select "Run as administrator".
Running Windows Media Builder

Image Configuration

Select the tab relevant to the version of Windows Media Builder in use.
Windows RT 8.1
Windows 10
Windows RT 8.1 IR5 Media Builder Main Menu
  1. 1.
    Select Device. Select target device by entering its number from the list.
  2. 2.
    Select Windows Update Mode.
    1. 1.
      All Updates for Windows
    2. 2.
      Longhorn/Golden Keys Jailbreak Safe
    3. 3.
      Myriachan Jailbreak Safe
    4. 4.
      Service Stack & Update 3 Only (Longhorn/Golden Key & Myriachan Jailbreak Safe)
    5. 5.
      Service Stack Only (Longhorn/Golden Key & Myriachan Jailbreak Safe)
    6. 6.
      No Updates (Longhorn/Golden Key & Myriachan Jailbreak Safe)
  3. 3.
    The default language is English (United States), would you like to select another language (Y/N)? Answering "Y" will display a list of available languages for Windows RT 8.1, select the language by entering its number from the list. Answering "N" will default to English (United States) and skip language selection.
  4. 4.
    Would you like to enable the Start Menu by default (Y/N)? This option will only appear if the new Start Menu update is included in the Windows Update Mode selected in Step 1. Answering "Y" will enable the Start Menu by default, answering "N" will leave the Start Screen enabled.
  5. 5.
    Would you like to update provisioned apps (Y/N)? Answering "Y" will update all provisioned Apps with the latest available versions, answering "N" will not perform any updates to the Apps that shipped with Windows RT 8.1 (IR5).
  6. 6.
    Would you like to uninstall provisioned apps (Y/N)? This option will only appear if provisioned Apps are not being updated. Answering "Y" will remove all provisioned Apps, answering "N" will not make any changes to the Apps that shipped with Windows RT 8.1 (IR5). Answering "Y" will offer further options to remove the following System Apps that are not normally removed. These additional options should be considered untested.
    • Camera
    • OneDrive & Photos (These Apps are a part of the same package)
    • Store
  7. 7.
    Would you like to uninstall BitLocker (Y/N)? Answering "Y" will remove BitLocker components, answering "N" will not make any changes to BitLocker. This option should be considered untested.
  8. 8.
    Would you like to uninstall Office 2013 RT Home & Student Plus (Y/N)? Answering "Y" will remove Office files and registry entries, answering "N" will not make any changes to Office. This option should be considered untested.
  9. 9.
    Would you like to uninstall Windows Defender (Y/N)? Answering "Y" will remove Windows Defender components, answering "N" will not make any changes to Windows Defender. This option should be considered untested.
  10. 10.
    Would you like to uninstall Adobe Flash (Y/N)? Answering "Y" will remove Adobe Flash components, answering "N" will not make any changes to Adobe Flash. This option should be considered untested.
  11. 11.
    Would you like to uninstall VPN Packages (Y/N)? Answering "Y" will remove VPN Package components, answering "N" will not make any changes to VPN Packages. This option should be considered untested.
  12. 12.
    Would you like to create a Windows Defender update package on the installation media (Y/N)? This option will only appear if Windows Defender is not being uninstalled. Answering "Y" will download Windows Defender updates and place them on the installation media, answering "N" will skip creation of the Office update package. Windows Defender updates cannot be integrated directly so once Window RT 8.1 installation is complete run the following as administrator where X:\ is the path to the USB drive: X:\Windows_Defender_Update_Pack\Defender_Update.cmd
  13. 13.
    Would you like to create an Office 2013 RT Home & Student Plus update package on the installation media (Y/N)? This option will only appear if Office is not being uninstalled. Answering "Y" will download and extract Office 2013 RT Home & Student Plus updates and place them on the installation media, answering "N" will skip creation of the Office update package. Office Updates cannot be integrated directly so once Window RT 8.1 installation is complete run the following as administrator where X:\ is the path to the USB drive: X:\Office_2013_RT_Update_Pack\Office_Update.cmd
  14. 14.
    Select Windows Setup Mode Select the Windows Setup Mode by entering its number from the list.
    1. 1.
      Windows Setup (Default)
      Creates installation media using default Windows Setup, this mode is not as touch friendly as the Windows Recovery Environment and does not create a recovery partition.
    2. 2.
      Windows Recovery Environment (WinRE)
      Creates installation media using the Windows Recovery Environment, this mode is touch friendly and will create a recovery partition.
    3. 3.
      Modified WIM Files Only (No Setup)
      Creates modified WIM files for manual installation.
  15. 15.
    Windows Image Compression Mode Select a Windows Image Compression Mode by entering its number from the list.
    1. 1.
      Windows Imaging Format (WIM) Format Offers shorter image creation time at the expense of lower compression.
    2. 2.
      Electronic Software Delivery (ESD) Format Offers higher compression at the expense of longer image creation time. Using this option will result in lower disk space usage on the installation USB and where applicable result in a smaller recovery partition.
  16. 16.
    Would you like to continue? (Y/N)? Previously selected options will be displayed along with information and warnings relevant to the chosen configuration. Answering "Y" will start the process of downloading any required files and building the image, Answering "N" will return to the Main Menu.
Example of a Confirmation Screen selecting Microsoft Surface 2
Example of a Confirmation Screen selecting Nokia Lumia 2520
Windows 10 Build 15035 Media Builder Main Menu
  1. 1.
    Select Device. Select target device by entering its number from the list.
  2. 2.
    Device Notes
    Would you like to continue? (Y/N)? Brief notes about the selected device will be displayed, for example the required level of Jailbreak or device incompatibility. Answering "Y" will continue to the next step, answering "N" will return to the Main Menu.
  3. 3.
    Would you like to install app pack (Y/N)? Answering "Y" will display a list of app pack options all, select the required option by entering its number from the list. Selecting any of the available options will uninstall the few provisioned Apps that are contained in Windows 10 Build 15035 by default. Answering "N" will skip to the next step.
  4. 4.
    Would you like to uninstall provisioned apps (Y/N)? This option will only appear if the app pack is not being installed. Answering "Y" will remove all provisioned Apps, answering "N" will not make any changes to the Apps that are contained in Windows 10 Build 15035.
  5. 5.
    Would you like to uninstall BitLocker (Y/N)? Answering "Y" will remove BitLocker components, answering "N" will not make any changes to BitLocker.
  6. 6.
    Would you like to uninstall Cortana (Y/N)? Answering "Y" will remove Cortana components, answering "N" will not make any changes to Cortana.
  7. 7.
    Would you like to uninstall Windows Defender (Y/N)? Answering "Y" will remove Windows Defender components, answering "N" will not make any changes to Windows Defender.
  8. 8.
    Would you like to set a Windows product key & KMS for activation (Y/N)? Answering "Y" will set a product key and Key Management Server address which will enable Windows to be activated, answering "N" will require these to be set manually after installation is complete.
  9. 9.
    Would you like to install Office 2013 RT Home & Student Plus (Y/N)? Answering "Y" will add a post installation automated setup of Office 2013 RT Home & Student Plus, answering "N" will skip further Office options. Office 2013 RT Home & Student Plus installation will automatically occur when the Windows desktop is reached for this first time, this part of the installation may take between 5 and 30 minutes depending on the updates selected.
  10. 10.
    The default Office language is English, would you like to select another language (Y/N)? Answering "Y" will display a list of available languages for Office 2013 RT Home & Student Plus, select the language by entering its number from the list. Answering "N" will default to English (United States) and skip language selection.
  11. 11.
    Select Office Update Options Select the Office Update level by entering its number from the list.
    1. 1.
      No Updates
    2. 2.
      Service Pack 1
    3. 3.
      Service Pack 1 & Post Service Pack 1 Updates
  12. 12.
    Select Windows Setup Mode Select the Windows Setup Mode by entering its number from the list.
    1. 1.
      Windows Setup (Default)
      Creates installation media using default Windows Setup, this mode is not as touch friendly as the Windows Recovery Environment and does not create a recovery partition.
    2. 2.
      Windows Recovery Environment (WinRE)
      Creates installation media using the Windows Recovery Environment, this mode is touch friendly and will create a recovery partition.
    3. 3.
      Modified WIM Files Only (No Setup)
      Creates modified WIM files for manual installation.
    4. 4.
      Modified Windows RT 8.1 Recovery Environment (WinRE)
      Creates installation media using a modified Windows RT 8.1 Recovery Environment, this mode will install Windows 10 and apply the Golden Keys jailbreak.
  13. 13.
    Windows Image Compression Mode Select a Windows Image Compression Mode by entering its number from the list.
    1. 1.
      Windows Imaging Format (WIM) Format Offers shorter image creation time at the expense of lower compression.
    2. 2.
      Electronic Software Delivery (ESD) Format Offers higher compression at the expense of longer image creation time. Using this option will result in lower disk space usage on the installation USB.
  14. 14.
    Would you like to continue? (Y/N)? Previously selected options will be displayed along with information and warnings relevant to the chosen configuration. Answering "Y" will start the process of downloading any required files building the image, Answering "N" will return to the Main Menu.
Example of a Confirmation Screen selecting Microsoft Surface 2

Output Options

Windows Media Builder after image modification
Once the process is complete the following options will be offered.
  1. 1.
    Would you like to create USB Installation Media (Y/N)? Answering "Y" will prompt for a USB drive to be selected, answering "N" will skip to the next step. The installation files can be written to USB from the Main Menu or copied manually at a later time if needed.
  2. 2.
    Would you like to create an ISO image (Y/N)? Answering "Y" will create an ISO image containing the generated installation files, answering "N" will skip to the next step. This step is not required and is for archival purposes, an ISO can be generated from the Main Menu at a later time if needed.
  3. 3.
    Would you like to create Windows to Go USB Media (Y/N)? This option will only appear if "Offer Windows To Go USB Output" has been enabled in the settings menu. Answering "Y" will prompt for a USB drive to be selected, answering "N" will skip to the next step. The installation files can be written to USB from the Main Menu at a later time if needed.
    For Windows RT 8.1 this option requires a USB drive that reports as "fixed", it will not work on a "removable" device. Only suitable drives will be listed for selection.
  4. 4.
    The path to the installation files will be displayed and the following prompt will be shown: Would you like to open this folder (Y/N)? Answering "Y" will open the folder where the installation files are contained, answering "N" will skip to the next step.
  5. 5.
    Goodbye Press any key to continue . . . All done, after a key is pressed Windows Media Builder will close.
Windows Media Builder after writing to USB
Windows Media Builder after writing ISO and exiting

Installing Windows

This will permanently delete any data stored on the device.
Select the tab relevant to the Windows Setup Mode being used.
Setup
Windows Recovery Environment
Modified Windows Recovery Environment
Windows Setup
Surface keyboards do not respond in this setup mode if it was connected at bootup, at present the workaround is to detach and then reattach the keyboard when the screen above is displayed.
  1. 1.
    Insert the USB created by Media Builder and Boot from USB.
  2. 2.
    Wait until the above screen is displayed and click "Next".
  3. 3.
    Tick "I accept the license terms" and click "Next".
  4. 4.
    Click "Custom: Install Windows only (advanced)".
  5. 5.
    If there are existing partitions present, select each one individually and click "Delete".
  6. 6.
    Click "Drive 0 Unallocated Space" and click "Next".
  7. 7.
    Once Setup files have been copied the device will reboot automatically.
  8. 8.
    Follow onscreen instructions to complete the Windows Out of Box Experience (OOBE).
Windows Recovery Environment
Select the tab relevant to the version of Windows being installed.
Windows RT 8.1
Windows 10
  1. 1.
    Insert the USB created by Media Builder and Boot from USB.
  2. 2.
    Wait until the above screen is displayed.
  3. 3.
    Select keyboard layout.
  4. 4.
    Select "Troubleshoot".
  5. 5.
    Select "Reset your PC".
  6. 6.
    Select target OS to be replaced if there is one, this step won't appear if the eMMC has been cleared before starting.
  7. 7.
    Select "Next".
  8. 8.
    Select "Yes, repartition the drives".
  9. 9.
    Select drive erasure level.
  10. 10.
    Select "Reset". Once Setup files have been copied the device will reboot automatically.
  11. 11.
    Follow onscreen instructions to complete the Windows Out of Box Experience (OOBE).
  1. 1.
    Insert the USB created by Media Builder and Boot from USB.
  2. 2.
    Wait until the above screen is displayed.
  3. 3.
    Select keyboard layout.
  4. 4.
    Select "Troubleshoot".
  5. 5.
    Select "Recover from a drive".
  6. 6.
    Select drive erasure level.
  7. 7.
    Select "Recover".
  8. 8.
    Once Setup files have been copied the device will reboot automatically.
  9. 9.
    Follow onscreen instructions to complete the Windows Out of Box Experience (OOBE).
Modified Windows Recovery Environment
Surface keyboards do not respond in this setup mode if it was connected at bootup, at present the workaround is to detach and then reattach the keyboard when the screen above is displayed.
This Setup Mode is only available in the Windows 10 Build 15035 Media Builder.
  1. 1.
    Insert the USB created by Media Builder and Boot from USB.
  2. 2.
    Wait until the above screen is displayed.
  3. 3.
    Type "1" at the command prompt to select Install Windows 10 and press Enter (Touch Installer window if onscreen keyboard is not visible).
  4. 4.
    Confirm you wish to proceed by typing "Y" and pressing Enter.
  5. 5.
    After installation is complete press any key to reboot.
  6. 6.
    After rebooting the Secure Boot Debug Policy Applicator will appear, use the Volume Keys to highlight "Accept and Install" and then press the Windows Key on the on device to confirm the selection.
  7. 7.
    After confirming the device will reboot, follow onscreen instructions to complete the Windows Out of Box Experience (OOBE).

Post Installation

Office 2013 RT HSP Update
Windows Defender Update
Window Update Cleanup
This applies only when using the Windows RT IR5 Media Builder and have selected the option to create an Office 2013 RT Home & Student Plus update package. This step does not apply when using Windows 10 Build 15035, any selected updates to an Office installation under Windows 10 will be applied automatically.
Windows Explorer may close and reopen when certain updates are installed.
  1. 1.
    Insert USB which contains the installation media generated by Windows Media Builder.
  2. 2.
    Open the USB drive in Explorer and open the Office_2013_RT_Update_Pack folder.
  3. 3.
    Right click on Office_Update.cmd and select "Run as administrator".
  4. 4.
    Follow onscreen instructions.
Office 2013 RT Home & Student Plus Update Pack
In progress
Complete
This applies only when using the Windows RT IR5 Media Builder and have selected the option to create a Windows Defender update package. This step does not apply when using Windows 10 Build 15035.
  1. 1.
    Insert USB which contains the installation media generated by Windows Media Builder.
  2. 2.
    Open the USB drive in Explorer and open the Windows_Defender_Update_Pack folder.
  3. 3.
    Right click on Defender_Update.cmd and select "Run as administrator".
  4. 4.
    Follow onscreen instructions.
Windows Defender Update Pack
In Progress
Complete
This applies only when using the Windows RT IR5 Media Builder and have selected any mode that includes applying Windows Updates.
Cleanup.cmd uses the /StartComponentCleanup parameter together with the /ResetBase parameter of DISM.exe on a running installation of Windows to remove all superseded versions of every component in the component store.
  1. 1.
    Open the C:\ drive in Explorer.
  2. 2.
    Right click on Cleanup.cmd and select "Run as administrator".
  3. 3.
    Follow onscreen instructions.
Windows Update Cleanup
In Progress
Complete
If Cleanup.cmd is not available on the installation then enter the following in Command Prompt (Run as administrator): dism /Online /Cleanup-Image /StartComponentCleanup /ResetBase

Media Builder Menu

Write Existing Installation Files

Windows Media Builder can write existing installation files that were previously generated, to access the list of existing installation files enter "W" at the Main Menu and press Enter.
Window Media Builder Installation Files
If any existing installation files are available they can be written by entering its number and pressing Enter, a confirmation prompt will be shown be before proceeding to offer write options for the selected image.

Settings

Windows Media Builder has some limited configuration settings but generally there is no need to change the defaults. To access the Settings Menu enter "S" at the Main Menu and press Enter.
Windows Media Builder Settings Menu
1: Select "Downloads" Parent Directory (Source Windows Media, Windows & Office Updates) - User requested option, changes the path where Windows Media Builder will download its files to.
2: Select "Tmp" Parent Directory (Temporary Files & WIM Mount Points) - User requested option, changes the path where Windows Media Builder will extract any temporary files and create any working directories.
3: Select "Windows_Media" Parent Directory (Output Windows Media) - User requested option, changes the path where Windows Media Builder places its output.
4: Bundled DISM - User requested option. Disabled by default, if enabled then Windows Media Builder will use the bundled copy of DISM.
5: Download Verification (SHA-1) - User requested option. Enabled by default, if disabled then Windows Media Builder will skip verification of any files that have been downloaded.
6: ISO/USB/VHD Media Label - User requested option, set a custom volume label for any generated ISO file or USB drive.
7: Windows 10 Enterprise / RT 8.1 Product Key - Change the Product Key applied the the generated install.wim.
8: Office 2013 Product Key - Option available for Windows 10 Builder 15035 Media Builder only, change the Product Key applied to the installation of Office 2013 RT Home & Student Plus.
9: KMS Address - Option available for Windows 10 Builder 15035 Media Builder only, change the address to the Key Management Services host server applied to the install.wim which will be used to activate Windows 10 Build 15035 and Office 2013 RT Home & Student Plus. 0: Torrent Download from Archive.org - Option available for Windows 10 Builder 15035 Media Builder only. Disabled by default, if enabled then Windows Media Builder will download any files from Archive.org via BitTorrent instead of HTTP. Enabling this option may improve download speeds but results may vary.
W: Windows Product Key Type - User requested option and available for Windows 10 Builder 15035 Media Builder only, will switch product key type between GVLK (Generic Volume License Key) and OEM:NONSLP (Non System Locked Pre-installation). Selecting GVLK will attempt to activate via the KMS selected under option 9, selecting OEM:NONSLP will attempt to activate via Microsoft using a modified upgrade ticket (HWID Activation).
Switching the product key type will automatically change the Windows product key selected under option 7.
O: Office Product Key Type - User requested option and available for Windows 10 Builder 15035 Media Builder only, will switch product key type between GVLK (Generic Volume License Key) and Retail. Selecting GVLK will attempt to activate via the KMS selected under option 9, selecting Retail will attempt to activate via Microsoft using a valid Office 2013 Home & Business key.
Switching the product key type will automatically change the Office product key selected under option 7 however the default Retail key provided will not activate Office, after switching to retail the user must enter their own valid Office 2013 Home & Business key under option 7.
Due to licensing restrictions Office 2013 RT cannot be activated on operating systems other than Windows RT. To avoid this restriction the SKU is changed after installation, if GVLK is selected then the SKU will be converted to Office 2013 Standard Volume License and if Retail is selected the SKU will be converted to Office 2013 Home & Business Retail.
G: Offer Windows To Go USB Output - User requested option. Disabled by default, if enabled "Windows To Go" output will be offered either after creating an image or when writing an existing one.
C: Enable Custom Addon - Option only available if \Addons\Custom\Custom.cmd exists, disabled by default. If enabled the commands contained within Custom.cmd will be optionally applied when building an image. For an example Custom.cmd file see \Addons\Custom\Custom_Example.cmd.
L: DISM Log Level - Option available starting with Windows Media Builder v2.3c only. This setting alters the amount of detail included in the "Log-DISM.txt" file that is included with Window Media Builder output. The available settings are:
  1. 1.
    Errors only.
  2. 2.
    Errors and warnings. (Default)
  3. 3.
    Errors, warnings, and informational.
  4. 4.
    All information and debug output.
D: Set Default Values - Returns Windows Media Builder to its default settings.
E: Exit Settings - Return to Main Menu.

Miscellaneous

To access the Miscellaneous Menu enter "M" at the Main Menu and press Enter.
Windows Media Builder Miscellaneous Menu

Update Download Lists

Entering "U" on the Miscellaneous Menu will check for any available updates to the download lists used by Windows Media Builder. If any updates are available a confirmation prompt will be shown before proceeding with the update.
Updates to Windows Media Builder download lists are generally made available after the second Tuesday of each month for any products still being supported, the lists may also be updated as needed if there are changes to the location of the files referenced in the lists.

Write Surface RT & 2 Jailbreak USB

Entering "W" on the Miscellaneous Menu will offer to write a copy of the of the Surface RT & 2 Jailbreak USB automatically.

Build QEMU Click-to-Run Package

Entering "Q" on the Miscellaneous Menu will start the regular Media Builder process for creating an image however instead of installation media the output will be a QEMU Click-to-Run Package that is capable of emulating Windows RT 8.1 or Windows 10 Build 15035 on a Windows x64 PC.

Troubleshooting

Windows 10 Build 15035 Media Builder
Common
  • Symptom: Surface RT or Surface 2 will boot the local Windows installation or boot loop if no local installation is found instead of booting from installation USB created using the Windows Setup or Windows Recovery Environment installation options. Fix: This issue is most commonly caused by not removing the Golden Keys / Longhorn jailbreak before attempting installation, for users of Surface 2 this may also be caused by not disabling Secure Boot using Yahallo. See the Surface RT & 2 Jailbreak USB page for information on jailbreaking the device or alternatively recreate the installation USB using the Modified Windows RT 8.1 Recovery Environment option.
  • Symptom: Errors occur during modification of the installation image which indicate that removal of Windows Defender components from the image has failed or Windows Defender is still present after installation despite it being selected for removal. Fix: Temporarily disable Windows Defender Tamper Protection on the host system and rebuild.
  • Symptom: Device will hang on the UEFI boot logo when attempting to boot from the installation USB and will remain hung until powered off with no error output provided. Fix: This is a known issue which at present has no fix, the only advice is to try building the installation media on another PC and perhaps use another USB drive.

Known Issues

Windows RT 8.1 IR5 Media Builder
Windows 10 Build 15035 Media Builder
Common
  • Attempting to remove or update provisioned apps in Windows RT 8.1 IR5 for Saudi Arabia, Bulgaria, Germany, Croatia, Hungary, Russia and Slovakia results in the following error:
    App packages (.appx) cannot be serviced on an offline image after a user has logged into the image.
  • Relies on Archive.org for some downloads and unfortunately the download speed can be quite slow. Downloading files located on Archive.org via BitTorrent instead of HTTP can sometimes be faster, this can be enabled via the settings menu in version 2.1 and above.
  • Cannot currently produce working images for Qualcomm devices (Dell XPS 10, Nokia Lumia 2520 & Samsung Ativ Tab).
  • Available in English only, there are no genuine Language Packs are available.
  • Display artefacts in Setup & Windows Recovery Environment on Surface 2. This issue or something similar is also present on Surface RT and probably the other Tegra 3 devices but it is considerably less noticeable.
  • If Cortana is removed the Cortana introduction page towards the end of OOBE is still present.
  • A limited number of users (15 as of November 2022) have reported the boot.wim and winre.wim output from Windows Media Builder is unbootable, the device will hang on the UEFI boot logo when attempting to boot from the installation USB and will remain hung until powered off with no error output provided. It is possible this may not be caused by Windows Media Builder as the issue persisted when a boot.wim was manually prepared by one affected user.

Version History

Windows RT 8.1 IR5 Media Builder
Windows 10 Build 15035 Media Builder

Credits

  • 7-Zip - Copyright (C) 1999-2019, Igor Pavlov.
  • Aria2 - Copyright (C) 2006, 2019 Tatsuhiro Tsujikawa.
  • DecryptESD - Copyright (C) 2017, Thomas Hounsell.
  • GNU Wget - Copyright (C) 1996-2008, Free Software Foundation, Inc.
  • QEMU - Copyright (C) 2003-2021 Fabrice Bellard and the QEMU Project developers. (Thanks to @x86corez & @driver1998)
  • SetACL - Copyright (C) 2012, Helge Klein.
  • Media Builder & Guide - @jwa4.