I just updated from BIOS 0350 to BIOS 0352 using RYBDWi35.86A.0352.EB.EXE
Upon restart, and logging back into Windows, I was presented with a strange message. I've done this before and it usually would say something like "BIOS Update complete" but this time it said "Current BIOS is an unsupported legacy BIOS". Huh? It's the latest BIOS just posted 2 days ago. What does that mean?
Can you try using the F7 update method instead and see what happens? You can download the latest bios version here:
Instructions for this update method are here: F7 BIOS Update Instructions for Boards and Kits
Let me know if you still get the same error.