Unless you have an Ivy Bridge CPU, which by your signature info you have not, then I would NOT upgrade to any of the 3x bios, I'm speaking from experience here, as I have tried them all and ended up going back to 0902 for my Gene-Z, all the 3xx bios have at least two bugs that I know of, one is the A0 debug issue as you have already pointed out and the other is a bug with the CPU Vcore being overvolted to 1.48v+ if 'Ai overclock Tuner' is changed from the default of 'Auto' to either 'XMP' or 'Manual' and/or changing memory frequency with all other bios settings at default.
The 3xx bios are only needed for Ivy Bridge CPU's, those with Sandy Bridge CPU's should stay clear of them.
Chassis: NZXT Switch 810. - MB: Rampage v Extreme x99. - CPU: Intel Core i7 5820k. - Memory: 16GB Ripsaw 4 DDR4 2400MHz. - GPU: 2x Sapphire Tri-X R9 290 OC Edition 4GB.
PSU: Corsair AX1200i. - Storage: 1x Samsung 830 60GB SSD + 1x Samsung evo 840 120GB SSD + 1x Samsung 850 Evo 250GB SSD + 1x Seagate Barracuda 500GB HDD.
OS: Windows 10 Pro x64.
