You are running BIOS 14.

It's not possible to update the OROM to 8.9.0.1023 as I've stated earlier. It throws a "HARDWARE_UNKNOWN" error when trying to use the AHCI/RAID controller mode. I would assume newer OROMs would give the same error, so I settled for 8.5.0.1030. It seems to solve some issues, so unless some more pop up I don't think I'll try to see if any newer version happens to work.