BIOS update history (according to Supermicro support):
1.1b
- Fix a FAN control malfunction problem after AC loss.
- Enable workstation, quiet, super quiet fan control mode for 4-pin fan only for revision 3.1 board.
- Change revision to 1.1b.
- Pass BIOS CHECK 4.0.0
1.1c
- Change FAN control by using FANOUT1 and FANOU2 instead of FANOUT2 and FANOUT3 according to hardware
- Change revision to 1.1C