Flash procedure of a modded bios file generated from original HP latest bios .bin file with insertion of Nvme module, as per Fernando's guide, ends/fails with an error (see picture in attach)

I 've been trying to flash by means of native setup utility of bios with modded file on usb pendrive.
Once launched and confirmed the Rom flash procedure, immediatly the error message appears.

Any possible help and hints on how can I flash modded file in HP z220 mob rom and finally get boot form Pcie Nvme module?
Is it possible to have any flash method w/o using a programmer?

EDIT by Fernando: Thread title shortened and specified

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

Zitat von dman79 im Beitrag UPDATE MICROCODE FOR I7 4790 ES (CONFIDENTIAL

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@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.

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