HP OMEX X 17-ap0xx

Hi guys.
I hope someone can help me modify BIOS.
First of all im on ver. F.27 and im trying flash F.21 (its been modify using AMIBCP to show adv. and chipset tabs in BIOS). But with no resaults… sadly

I was trying using official HP Tool (Recovery usb) error with signature. AFU under DOS, give me errors depands on ver. error d4 - block size / bios does not suport AFU

Im constant hitting a wall, changing ver. using hexeditor also failed.
Ty for reply

AMIBCP is not valid anymore for modern AMI Aptio V core bios files… these are old “leak” tools from AMI IV generation.

Alternative here: [TOOL] UEFI Editor - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)

But the same maybe applied…
Guide Request for OMEN 17T-CK200 - BIOS/UEFI Modding / BIOS Modding Requests - Win-Raid Forum (level1techs.com)

Further inquiries, post on the linked threads or wait for more users anwsers.