Gigabyte X48-DQ6 F8i bios mod

[janos666]

I removed the backup flash to solve the „wrong checksum” error.
The recovery happened with my own modified (I tried to update the RAID option ROM) image as well as with a stock x48-dq6 image (crossflashing from ds5 - this was not the original idea but ... Why not if it's possible?).

I know it was more risky to do this much changes at once but the problem would have occured at a point anyway.
I would be here even if I do this from step-by-step. Of course, now I must do it step-by-step to figure out what went wrong but I could have saved some time if I am lucky...
(I guess the problem was the wrong Jmicron ROM in the mod and I have to create a modified image for myself.)

[alien_DSK]

Hello! I have a problem:

I installed the Bios F8i by "Qflash" and after restart has given me "checksum error" and then loaded the original bios. Windows booted correctly.
Moments after I installed a F8d, also for "Qflash" with latest Intel and Jmicron firmware, and does not reach the bios post, no logo appears.

I reset the bios (CLR_CMOS), I removed the battery, disconnected the ATX cable, nothing. Will not start.

Help please.
Thanks.