rx 480 has all power plugged in device manager only shows the 580 and claymore only says 1 gpu detected. The 480 works if i remove the 580 card. Sorry i cant get screen print to work.
OK, the problem is that the 480 is not being recognised by Windows. If it's not in device manager, it won't be found by Claymore, etc, etc. Nothing to do with the modded bios.
Almost definitely due to your MB settings. Crossfire won't stop the card being recognised, but might hinder mining.
Have you tried different slots in the MB? Read the manual, read up online, and using a riser for the second card will make switching slots easier... Best of luck!
TBH some MBs just refuse to play ball, and it is much better to get a known mining MB and save the hassle - H81 pro btc or Asus H110 as already mentioned...