[Request] How to flash a modded BIOS into an HP Z220 mainboard

[kinghat]

i have a couple of these boards so i am following along. i found this:

@dman79

@gloobox Did you ever get your HP 800 G1 DM flashed. I have one too and was going to mod it but got distracted trying it on my HP Z220 instead and everything has been the same so far except setup_var was 0x68, 0x69, 0x6A, 0x6B, 0x6C instead of the HP 800s 0x96, 0x97, 0x98, 0x99, 0x9A, for flashing bios i did this.

1. fptw64 -I which should tell you bios address start. for HP z220 it was 0xA90000
2. fptw64 -BIOS -D backup.rom
3. mod and add NvmExpressDxe_4.ffs to backup.rom save it as modded.rom
4. use a hex editor like frhed to delete the end of the file leaving only first 0x55FFFF bytes
5. fptw64 -A 0xA90000 -L 0x55FFFF -F modded.rom

0xA90000 + 0x55FFFF = 0xFEFFFF
0xFEFFFF + 1 = 0xFF0000
and 0XFF0000 -> 0xFFFFFF = the write protected region.

reboot and dump bios again and open it in mmtool to see if nvme module is still there. It was for me.
I ordered my nvme drive and riser card but won’t be here till saturday to make sure it works. but i was able
to shut off computer and reboot just fine.

from this thread: [i-cant-post-links]t6663f47-UPDATE-MICROCODE-FOR-I-ES-CONFIDENTIAL-1.html#msg127624