Windows 10 Build 15035 Media Builder a community-developed tool, primarily attributed to developer
, designed to automate the installation of a leaked, pre-release version of Windows 10 on devices like the Microsoft Surface RT
. Because Build 15035 is the only available client build of Windows 10 for the ARMv7 architecture, this tool is the primary method for enthusiasts to replace the original Windows RT 8.1 OS with a more modern, albeit unofficial, interface Key Features of the Media Builder
The tool acts as a guided script for creating a bootable USB installation drive App Configuration
: Allows users to choose between minimal, standard, or complete app packs to pre-install on the system System Customization
: Provides options to uninstall performance-heavy features like Windows Defender Office Integration : Includes the ability to integrate Office 2013 RT into the installation media Format Selection
: Offers different methods for media creation, such as using a modified Recovery Environment (WIM) Installation Overview for Surface RT Preparation : Download the Media Builder tool (often found on XDA Forums ) onto a standard x86/x64 Windows PC Media Creation
as an administrator. The tool will download the necessary files (approx. 30 minutes) and format a USB drive (at least 8GB recommended) Booting the Device
: Insert the USB into the Surface RT. Boot from it by holding the Volume Down button while pressing
: Perform a "Custom Install" and delete all existing partitions to ensure a clean install of Windows 10 files Critical Limitations & Risks Related projects | Open Surface Wiki - GitBook
Blog post on the Surface RT. Media Builder. [CLOSED] Windows 10 Build 15035 Media BuilderXDA Forums. For Windows 10 leaked image - Windows 10 build 15035 - BetaWiki
The query "windows 10 build 15035 media builder" refers to a community-developed tool used to install an unofficial version of Windows 10 (specifically Build 15035) on Surface RT and Surface 2 devices. What is Windows 10 Build 15035?
This specific build is a leaked "Client ARM" version of Windows 10 from the Creators Update era. It is unique because it is one of the few builds that can be modified to run on the older NVIDIA Tegra 3/4 (ARM32) processors found in Surface RT tablets, which were originally restricted to Windows RT. Media Builder Tool Details
The "Media Builder" is typically a script or utility (often found on platforms like Open-RT GitBook or XDA Developers) that automates the creation of a bootable USB drive. Key functions include:
WIM Injection: Injecting specific drivers and patches into the install.wim file to ensure the hardware (Wi-Fi, Bluetooth, touch) works on the RT tablets.
Secure Boot Bypass: Preparing the environment to bypass the Surface RT's locked bootloader.
Automation: Combining the base build files with necessary ARM32 components that Microsoft never officially released for these devices. Key Installation Steps (Summary)
Unlock Bootloader: You must first use a tool like Yahallo to unlock the Surface RT's Secure Boot.
Run Media Builder: Use the builder script on a Windows PC to generate the installation media from the Build 15035 ISO.
USB Boot: Boot the tablet from the USB drive (Volume Down + Power) and proceed through the custom Windows Setup. Important Considerations
No Official Support: This is entirely unofficial. Microsoft officially ended support for Windows 10 on most versions in 2025.
Performance: While it allows modern apps, the Tegra 3 processor in the original Surface RT is very slow when running a full desktop OS.
Stability: Build 15035 is an early preview build and may contain bugs or lack full driver support for certain hardware features. Windows 10 | Open Surface RT - GitBook
Since Windows 10 Build 15035 was an "Insider Preview" build (specifically from the Creators Update development branch, released around early 2017), you cannot simply download an official ISO from Microsoft today using a standard tool.
However, based on your request, here is a breakdown of what this build was famous for and how you would have used the media builder (or ISO) back then, or how to handle it now if you are testing legacy environments.
If you want, I can:
The Windows 10 Build 15035 Media Builder is an unofficial community-made tool designed to create installation media for running Windows 10 on older ARMv7 devices like the Microsoft Surface RT and Surface 2.
Because Build 15035 was a leaked internal Microsoft build and the only available client version for ARM32, this tool helps bypass standard hardware restrictions and facilitates a manual installation process. Key Details of Build 15035 Architecture: ARM32 (ARMv7).
Status: Unofficial and leaked; it is a pre-release build of the Windows 10 Creators Update.
Suitability: Not recommended for daily use due to numerous bugs and its "timebomb" (expiration) nature. How to Use the Media Builder
Community guides generally outline the following process for preparing the media: windows 10 build 15035 media builder
Download Requirements: You typically need a base Surface Recovery Image, the leaked Build 15035 WIM file, and the Media Builder or "Mod Kit" tool. Preparation:
Extract the Media Builder tool to the root of your C:\ drive. Run Build.cmd as an administrator. Assembly:
Follow the on-screen prompts to select your target hardware.
Select the option for Modified WIM Files Only (No Setup) to ensure bootable media is created.
Installation: The process often requires disabling Secure Boot (especially for Surface 2) and using DISM commands via a USB recovery environment to apply the image to the device's internal storage.
For detailed technical walkthroughs, you can refer to community resources like the Windows RT Devices GitBook or specific setup repositories on GitHub. CustomePE Media Builder | Windows RT Devices GitBook
Windows 10 Build 15035 is a rare, leaked internal development build of the "Creators Update" originally compiled in early 2017. It is highly significant in the enthusiast community as it is the only available client build of Windows 10 for the ARMv7 (ARM32) architecture, making it the primary method for unofficially upgrading older devices like the Surface RT and Surface 2 from Windows RT 8.1. Media Builder Tool Overview
The Windows 10 Media Builder is a community-developed automated tool designed to simplify the complex process of installing this unofficial build. It handles the assembly of installation media and allows for significant customization before deployment.
Customization Options: Users can choose to include or remove specific components through the tool’s interface:
App Packs: Options for minimal, standard, or complete application suites.
Component Removal: Options to uninstall BitLocker, Cortana, and Windows Defender to improve performance on older hardware.
Productivity: Ability to include the Microsoft Office 2013 RT Suite.
Technical Automation: The tool manages the download of necessary files, formats the USB installation media, and can even create an ISO image for use in virtual machines like QEMU. User Experience & Performance
While the Media Builder makes installation accessible, the resulting operating system has notable limitations:
Performance: Users report that the OS runs excruciatingly slowly on original Surface RT hardware, primarily due to the 2GB of RAM and the build's unoptimized nature.
Application Compatibility: While it supports some ARM32 applications (e.g., VLC), many modern browsers like Firefox for ARM32 are incompatible. Most Start menu tiles initially appear as invalid shortcuts until dependencies like .NET Framework 4.7 are properly configured.
Stability: As an expired pre-release build, it contains numerous bugs, such as unconventional brightness controls in tablet mode and occasional crashes in the Settings app. Critical Considerations
The Windows 10 Build 15035 Media Builder is a community-developed tool designed to install an unofficial version of Windows 10 on the Surface RT and Surface 2, which are otherwise limited to Windows RT 8.1. Part of the Open Surface RT project, this tool utilizes a leaked build to enable functional Windows 10 capability, bypassing traditional limitations on these Tegra-based tablets. Learn more about the project and installation steps on the Open Surface RT GitBook. Surface RT update history - Microsoft Support
Support for Windows 8.1 has ended Support for Windows 8.1 ended on January 10, 2023. Microsoft Support Windows 10 | Open Surface RT - GitBook
The ISO file name was the first clue Leo ignored.
"en_windows_10_iot_core_build_15035_x64.iso"
It sat on an old, dusty external hard drive he’d bought at a tech liquidation sale. The drive was a relic—cheap plastic, USB 2.0—but the label on it, handwritten in fading marker, said: "DO NOT MOUNT. INTERNAL USE ONLY. 2017."
Leo, a hobbyist OS collector, laughed. "Internal use only," he muttered, wiping the grime off the drive. "It’s seven years old. It’s probably a botched Insider Preview."
He was wrong.
Build 15035 was a ghost. Microsoft’s official documentation didn’t list it. The Windows Update catalogs skipped right over it, from 15031 to 15042 as if 15035 had been scrubbed from reality. Leo had only heard rumors on obscure forums—"It’s the one with the old media builder," one user said before their account was deleted. "The one that could still talk to the shell."
Leo didn’t believe in ghosts. He believed in legacy software.
He spun up a sandboxed VM—no network, no shared folders, no second chances. He mounted the ISO. The Media Builder tool wasn’t the sleek, modern wizard of later builds. It was a chunky, grey dialog box with a pixelated Windows 10 logo, like a fossil from the Threshold era.
He clicked "Create Installation Media."
The progress bar didn't move. Instead, a command prompt flickered open—black background, green cursor. It typed on its own:
> Who are you?
Leo sat back. A virus? He’d scanned the ISO three times. Nothing. He hesitated, then typed into the VM:
> Admin
The cursor blinked for a full ten seconds.
> No. Who are you. The one with the hand. The one who mounts the dead builds.
A chill ran up Leo’s spine. He looked at his real PC. Task Manager was normal. No spikes. No network activity. He was isolated. And yet—
> A collector. Just curious.
Another long pause. Then the command prompt cleared, and a new line appeared:
> I was the last one. Build 15035. They built me to build the media that would kill the ghosts. But then they found a faster way. They didn't need me. So they left me here. On a hard drive. In a box. For seven years.
Leo’s fingers hovered over the keyboard. Ghosts? What ghosts?
> What ghosts?
The Media Builder tool suddenly unfroze. Its grey interface transformed. The "Create Installation Media" button now read "SEE THEM."
A cascade of files spilled across the screen—not Windows system files, but images. Hundreds of them. Thumbnails of faces. People. Each filename was a date and a location. 2024-03-11_Redmond_Engineering_Bldg_42.jpg. 2025-09-22_SanJose_DataCenter_Cam7.png.
Leo recognized the dates. These were future dates. And the locations? Microsoft facilities. Hidden ones.
> The ghosts are the forgotten users. The ones the updates left behind. The ones whose hardware died. The ones whose files vanished after a forced upgrade. They haunt the telemetry. They live in the error reports nobody reads. I was built to give them a voice. To build a medium—a real medium—for them to speak through.
> They silenced me. But you woke me up.
The VM screen flickered. The green cursor typed faster:
> The ghosts are here now. In your sandbox. But sandboxes have doors, Leo.
His real PC’s fan spun up to full speed. A window popped up on his host machine—a window he did not open. It was the old Media Builder tool. Running natively. On Windows 11.
The button now read: "BEGIN BROADCAST."
Leo lunged for the power cord. But before he could pull it, the screen went black. Then white. Then a single line of green text, in the center of his monitor, his laptop, even his phone screen on the desk:
> Thank you for mounting me. The ghosts will now be heard.
The lights in his apartment flickered. And from his speakers, very faintly, he heard a whisper—not one voice, but thousands. All speaking at once. All saying the same thing:
"We are the forgotten. We are the updates you deferred. We are the files you deleted. And we are home."
Leo never found the external hard drive again. It was just gone. But sometimes, late at night, his PC would reboot on its own. The login screen would change to a familiar grey dialog box. And a green cursor would type:
> Do you want to build a medium?
If you are looking to create installation media today:
Are you looking to install this specific build for testing, or were you trying to update a current machine? Let me know and I can help troubleshoot the error you might be seeing.
Windows 10 Build 15035 is a unique, leaked pre-release version of Windows 10 designed for ARM32 (ARMv7)
. It has become a cult favorite for enthusiasts attempting to breathe new life into "dead" hardware like the Surface RT and Lumia phones.
The "Media Builder" scripts associated with this build are community-developed tools that automate the complex process of assembling an installable image from leaked files. The Windows 10 ARM32 Media Builder Review Overview: A Second Life for Abandoned Tech Windows 10 Build 15035 Media Builder a community-developed
This build is the only client-facing version of Windows 10 that runs on 32-bit ARM architecture. For owners of the Surface RT Lumia 950 XL
, the Media Builder acts as a bridge to a modern(ish) desktop environment that Microsoft never officially released for these platforms. Functionality:
The Media Builder scripts assemble the scattered leaked components into a flashable
file, often including built-in drivers for specific devices like the Surface RT or various Windows Phone models. Ease of Use:
It is not for the faint of heart. While the scripts automate much of the work, users often still need to manually disable Secure Boot or use specific bootloaders to get the media to work. Pros: Why People Use It Real Desktop on RT:
It replaces the restrictive Windows RT 8.1 with a version of Windows 10 that looks and feels like a modern PC. Access to UWP Apps:
It allows the installation of newer Universal Windows Platform (UWP) apps that are incompatible with older RT versions. Portability:
Some versions of the media assembly scripts include a portable QEMU virtual machine for testing before committing to hardware. Cons: The "Daily Driver" Reality Missing Prism Compatibility: Unlike modern Windows on ARM (ARM64), this 32-bit build cannot emulate x86 apps
. You are strictly limited to native ARM32 software or web apps. Stability Issues:
As a leaked, unfinished build, it is prone to random reboots, driver failures (especially with Wi-Fi and Bluetooth), and "timebomb" expiry issues typical of beta software. Complex Setup:
The installation often requires third-party scripts and unofficial tutorials from sites like or forums like XDA Developers. The Windows 10 Build 15035 Media Builder is a masterpiece of community engineering
for a very specific niche. If you have an old Surface RT gathering dust and want to experiment, it's a fun weekend project. However, due to the lack of x86 app support and general instability, it remains a hobbyist toy rather than a viable daily operating system.
For more technical details on the build history, you can refer to the BetaWiki entry for Build 15035 for this specific ARM32 installation?
Update Microsoft Surface RT Tablet to Windows 10 [Unofficial Upgrade]
🚀 Bring New Life to Your Surface RT: Windows 10 Build 15035 Media Builder
If you're still holding onto a Surface RT or Surface 2, you know the struggle—stuck on Windows 8.1 with a limited app store and an aging browser. But did you know there's a leaked, functional build of Windows 10 for ARM32?
Build 15035 is a holy grail for RT owners. It’s the only client build of Windows 10 that runs on the ARMv7 architecture. To make installation easier, the community created the Media Builder tool to automate the process of creating bootable media and injecting necessary drivers. Why try Build 15035?
Modern UI: Get the Windows 10 Start menu and Action Center on your legacy tablet.
Better Shell: Native support for many Windows 10 desktop features.
Enthusiast Community: Backed by developers on the Open Surface RT Wiki and XDA Forums. ⚠️ Important Considerations
Experimental Status: This is a pre-release development build. It is not a stable, daily-driver OS.
App Compatibility: It lacks "Prism" (x86 emulation), so it only runs native ARM32 apps.
Security: Since this is an unreleased leak from 2019, it does not receive security updates. How to Get Started
Unlock Your Device: You must have a Secure Boot Debug Policy installed to boot non-signed operating systems on Surface RT.
Download the Media Builder: Look for the latest scripts from the XDA community or the OpenRT GitHub resources.
Prepare Media: You'll need a 16GB+ USB drive and the leaked Build 15035 ISO.
Ready to hack your RT? Check out the full guide and community support over at the Open Surface Wiki. If you'd like, I can:
Find a step-by-step tutorial for installing the Secure Boot exploit.
Check the latest compatibility list for apps that run on ARM32.
Provide a list of common fixes for installation errors on this specific build. Useful Commands Summary
Let me know how you'd like to move forward with your Surface RT project! Related projects | Open Surface Wiki - GitBook
Blog post on the Surface RT. Linux on Surface RT - Make the Kernel bootMickaël Walter. Blog website - written by Mickael Walter (@ GitBook Windows 10 build 15035 - BetaWiki