If you go to the link FP91G posted here, you can see your model, check twice if it's the right model
On Link section, you can check on details first and see most bios can fit on Hynix, Samsung or Elpida, the same bios is right and fit for more than one memory brand



Example in this image, on Memory Support you can see the brands Samsung or Hynix

https://www.techpowerup.com/vgabios/?architecture=AMD&manufacturer=XFX&model=RX+580&interface=&memType=&memSize=&since=
Modify your bios in any way.
There are many instructions on YouTube on how to modify the BIOS for the RX 5xx series.

What else programs are you using? amdmemtweak, overdriventool? tell all your system and progs you are running with?

Do all of the GPUs have the same memory type?
How did you do the flashing, did you use right timings?
What are the temperatures of the GPUs (are they different)?
Have you tried to change the riser?

and wmy rig working now 143mh/s but ethermine i see this rig dont work until 40 min. ethermine does it for the 4th time today. why is this happening

How do you view the mobo and the mining.

Ie where is the monitor plugged into.