Change the Windows 11 Boot Screen

You can use a program called HackBGRT on GIThub to modify the Windows 11 boot screen

The standard warnings are that you can potentially mess up a system using this, so you should tread with caution.  

This video by Techy Druid really helps to explain it!

Basically, you create a BMP and in the folder that you download there is a file called SPLASH.BMP

Save the file there (as a bmp)

Run the tool (AS ADMINISTRATOR)

The first option will be to "INSTALL" or "i"

Press that.  You will be shows the SPLASH.BMP page in PAINT.  You can make additional adjustments if you want, then close the file.

The rest will happen automatically. 

If successful, you can reboot and it will show the boot screen you created.

NOTE:

Chances are on a reboot you'll get a verification error message similar to the one below.

CLICK "OK"

Perform a Key management

Select Enroll has from disk

If asked, select the drive containing your boot drive

Select "EFI/"

Select HackBGRT

Select Grub64.efi

Select 

CONTINUE

Select YES

Select REBOOT