Thanks Roman!! I had to use the Z-switch to actually be able to flash my UD4-board. Before it said "BIOS cheksum error" (like it did in Q-Flash). How come? Does it compare the cheksum of the backup-bios against it? I have the F4-Bios as the backup, and after a system crash, the board reloaded the backup bios, because it -redetected the F7H bios from roman as "cheksum bad". I've double-checked the download, that is okay. How do I flash the backup-bios of the part? added, to update backup bios from main bios, you need to press ALT-F12 during POST Thanks, Don