[Microsoft Surface] ptrkhh:
For those of you missing Windows 8.1, congratulations, you just found the solution.

Download

OneDrive http://1drv.ms/1SGHo5e

MEGA https://mega.nz/#F!ks8gjaZT!oQx3xt9ET0nXe8JbKDvtsA

Features

1.Windows is fully updated as of February 2016.

2.Surface February update included (solves most speaker popping issue)

3.Based on Surface Pro 3 image. Full stock-like Surface branding (desktop background, out-of-box experience).

4.Windows activates with the embedded product key. Fully legit. I cannot guarantee if yours couldn’t activate though.

5.Bloat free with about 3 GB saving: (Microsoft devices are shipped bloat-free? Think again.) | Only 6 metro apps included (Camera, IE, OneDrive, PC Settings, Photos, Store). The rest can be downloaded from Store | Trial Office removed | Speech data removed.

6.Languages included: English, French, Spanish. Since it is Windows 8 Pro, you can download any other language later.

7.Fully working refresh and reset functionality.

8.WinRE from vanilla Windows, touchscreen driver included.

9.Pagefile takes less space: 400 MB. It can grow to up to 8 GB, a reboot brings it back to 400 MB.

10.Various Windows tweaks | File Indexing paused on battery | Verbose messages, you get more information in boots and shutdowns | No startup programs delay | non-certified DLNA devices are supported | Custom resolution script added (open C: drive, its there. Just double click.) | "Get Windows 10" system tray icon disabled.

11.Some drivers from S3, SP3, SP4, and other OEM devices (kudos to them for releasing their Skylake devices with Windows 8.1 drivers).

12.Latest Intel iGPU driver (version 4380 Beta).

NOT working

1.Windows Hello. As expected, Windows 8.1 does not support Windows Hello.

2.The buttons are mapped differently | Power --> Volume Down | Volume Up --> Power | Volume Down --> Start

3.Surface app | You cant adjust pen sensitivity | You can't configure the pen top button action through the app. You can still customize it manually with AHK.

FAQ

Q: Camera app crashes / BSOD

A: You need to disable the IR camera. You can do that either via the BIOS or Device Manager.

Q: The pen button doesn't work after the first setup

A: You may need to re-pair the pen. Go to PC Settings > Bluetooth and remove the Surface Pen. Create a new pairing by pressing the pen top button for 7 seconds, it will show up on the Surface, and just pair it.

Q: How did you get the embedded Windows 10 product key to work with Windows 8.1?

A: Actually I have no idea. It just worked.

Q: Are the "not working" issues going to be fixed?

A: For the buttons, its up to Microsoft to release a Windows 8.1 compatible driver, and we have no other source as Microsoft has modified Intel's driver. If you know how to remap the buttons (either via editing the driver, Registry, or AHK), please share it with us and I will include it in the next version. For the Surface app, I believe it is simply because the Windows 8 version of Surface app was not updated for the Surface Pro 4 (and will never be), so don’t expect that one.

Q: Why did you go with the beta driver for the graphics?

A: The latest release version, 4352 and 4364, are practically unusable. I experienced blank screen in video playback and some random BSOD. No choice really.

Q: When Intel has released the new driver, do I need to wait for the next version of the ROM?

A: No, you can just download and install it yourself without waiting for me to upload an updated ROM. The new version should pop up here, download the ZIP version for Windows 8.1, and install it using the "Have Disk…" method. Step-by-step guide http://www.windowscentral.com/how-install-intel-beta-graphics-drivers-surface

Q: How do I remap the pen buttons manually?

A: Go browse /r/Surface in Reddit, they have comprehensive guides on how to use AHK with the Surface Pen.

Q: Do I need to wait for your next ROM to get Windows updated?

A: No, you can just update normally via Windows Update

Q: You idiotic luddites should just upgrade to Windows 10 rather than shoehorning Windows 8 to the cutting-edge device that clearly does not deserve the old, ****ty Windows 8. Also, I am a Windows 10 fanboy.

A: Before you get angry and all that, I actually *do* want to upgrade to Windows 10. I mean, how cool is that to login with your face? However, it is hampered by quite a lot ergonomic usability issues, bugs, and the general quirkiness of Tablet Mode. As of today, Tablet Mode is nowhere near final. Not even the Task View has proper animation in Tablet Mode, it already tells how half-assed the Tablet Mode is.

How to install

BACKUP BACKUP BACKUP!!! This will format the entire disk. No data will be preserved! Its also advised to remove the microSD card during the process.

0. Get a keyboard and USB hub if you don’t have the Type Cover.

1. Download and extract the package

2. Set up the ISO image on a CD or USB stick. If you use Rufus, set it on "MBR for UEFI computer" (only for the USB stick, the Surface will be set up as GPT)

3. Boot it on the Surface

4. Enter cd /d D:\scripts

5. Enter diskpart /s part.txt

6. Enter apply D:\Images\install.wim D:\Images\winre.wim

7. You can repeat the step #6 just to be sure

8. Reboot, unplug the USB stick.