The motherboard is HP Elitedesk 800 G1 DM. My primary goad is (1)to add the missing NVMe module (NvmExpressDxe_4.ffs), then (2)unlocking cfg lock and default it to disabled, (3)unlock DVMT Pre-Allocated and default it to 96M.

I read the ROM file from motherboard directly using Programmer, and flashing it back in the same way. so far it looks like NVMe module works but none these hidden menu are showing. I am attaching both stock ROM file and modded one by myself here, appreciate if someone can help me to dig out what could be missing to unlock these hidden menu.

https://wetransfer.com/downloads/0016bf7...08145323/21f988


Edit: I used AMIBCP v4.53 for unlocking

The menu to lock are located here:

advance > cpu configuration > cfg lock
chipset > system agent... > Graphics config > DVMT Pre-Allocated