Reverting 10X boot restrictions & returning to classic 10

Prerequisites

• A Windows 10 Setup USB of an identical or higher version than the 10X build you've used
  • For example if you're on 10X build 20279, you'll want Windows 10 Insider Preview build 20279 or newer (download here)
• An x64 EFI shell (click here to download)
• gdisk64.exe (extract from ZIP) (click here to download)

Before you begin, make sure Secure Boot is turned off on the machine you wish to roll back to classic 10

Tweak USB contents

• Plug in the setup USB drive
• Navigate to efi\boot inside your USB drive
• Rename the existing bootx64.efi file to winx64.efi
• Copy the EFI shell file you've downloaded to that directory and rename it to bootx64.efi
• Create a file on the root of your USB drive called startup.nsh and open it in Notepad
• Paste this text into Notepad and save the file:

  dmpstore -d SecureBootPlatformID -guid 77FA9ABD-0359-4D32-BD60-28F4E78F784B
  fs0:\efi\boot\winx64.efi
  fs1:\efi\boot\winx64.efi
  fs2:\efi\boot\winx64.efi
  fs3:\efi\boot\winx64.efi
  fs4:\efi\boot\winx64.efi
  fs5:\efi\boot\winx64.efi
  fs6:\efi\boot\winx64.efi
  fs7:\efi\boot\winx64.efi
  fs8:\efi\boot\winx64.efi
  fs9:\efi\boot\winx64.efi
  fsA:\efi\boot\winx64.efi
  

• Copy gdisk64.exe to the root of your USB drive
• The USB drive is now ready to use

Extra troubleshooting

Recent devices with Intel Pentium (Gold) chips that use Insyde BIOS are prone to entering a faulty Secure Boot state, resulting in the machine booting to a black screen with Security Boot Fail written in the middle, even though UEFI says Secure Boot is off. To fix this issue, do the following:

• Turn Secure Boot on
• Save changes and boot to UEFI settings again
• Turn Secure Boot off
• Secure Boot should now be fully disabled

Erasing the Windows 10X disk layout

• Boot your Windows Setup USB
• Press Shift-F10 to open the Command Prompt
  • If nothing happens, you may need to also press the Fn key if your keyboard has one
• Find the drive letter of your USB drive (for example D:)
  • An easy way to do this is to run Notepad and use the File>Open menu item, then go to This PC and look for it
• Navigate to it using this command (don't forget to use the appropriate letter for your own USB)

D:

• Run spaceutil to find the ID of your physical drive

spaceutil get-drive -poolname ospool

• In spaceutil's output look for the #### column, the value can for example be 0
• Double check that the ID is correct by running gdisk64
  • Don't forget to change X in the command to the ID of your drive

gdisk64 -l \\.\physicaldriveX

• Make sure that the output of gdisk64 contains OSPool and other partitions of Windows 10X
• Use gdisk64 to clean up the drive using the following commands
  • Don't forget to change X in the command to the ID of your drive

gdisk64 \\.\physicaldriveX
o
w

then press Enter

• Type exit to close the Command Prompt

You can now continue installing Windows 10 like you usually would