By placing a specific EI.cfg file into the sources folder of your Windows 8.1 USB installer, you can force the setup wizard to display the "Select the operating system you want to install" screen. This allows you to choose between Windows 8.1, Windows 8.1 Pro, or Windows 8.1 Single Language, regardless of what product key is hidden in your BIOS.
[EditionID] [Channel] Retail [VL] 0
There are three specific scenarios where you need an ei.cfg file: download ei.cfg file for windows 8.1
[EditionID] Core [Channel] Retail [VL] 0 By placing a specific EI