My 720/550 do the same thing on my M3A79-T with Modded Bios and wont even work with any stock Bios by ASUS.
My UD4P Unlocks both flawless with STOCK BIOS F5....
Id say the Mobo has to do alot with what works and what dosnt... Gigabyte has the best success so far .Even there low line UD3 unlocked both of mine too when tested for a friend while he waits for a new 550.






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