Everthing said so far is not the easiest solution. I had this same problem and i figured out that if you go to https://www.asus.com/Tower-PCs/K30BF/HelpDesk_BIOS/. And then download this
Version 0602 2015/10/233.95 MBytes
Update BIOS version: 0602 (for A55 MB)
Model: K30BF/M32BF/K31BF
it...