Help updating my b650i

Hello,

After completing my ITX build, I realized I had an outdated BIOS. I only noticed this after the system became unstable when I activated the EXPO profile.

Well, according to my research, the BIOS update here requires using Flashback and the Biosubu method, which I wasn’t familiar with until now.

The current BIOS version is 4.41 (3.30 is preinstalled)—I extracted the ZIP file as a ROM onto a USB drive formatted to FAT32. However, according to the manual, a separate “BIOSUBU file” is also required, which I can’t find anywhere.

Can anyone perhaps help me out and explain the process?

Hardware:

AMD Ryzen 5 9600X

Asrock B650i Lightning WIFI

Thank you very much!