AMI Aptio V flashing question

[arthurious]

Hi to all!

I've faced a problem where I cannot flash a modded bios on my laptop.

I tried afuefi - it just won't go past the security check, giving out error 18 (since the AMIBCP which I used to mod the bios saves roms unsigned)
Tried flashing it with FPT.efi - it does flash succesfully, but after reboot I'm getting a straight-up brick.
I even bought ch341 programmer to get the work done, however even that didn't help (the rom is on the chip, verifies well, no boot, dead brick)

Looks like there's some kind of internal check (Idk whether its hardware or not) that backreads rom image and makes sure it's signed if not it doesn't allow system to boot

So how do you guys cope with this?

Is there a way to maybe save modded bioses signed or bypass the error 18 "secure flash rom verify fail"? 

Should I use some other modding utility rather than amibcp??