BIOS CHIP GIGABYTE X399 AORUS PRO, Z390 AORUS XTREME, B365 M AORUS ELITE, Z390 M

You will need a new bios chip for the following purposes As a backup chip in case the current BIOS Chip is corrupt. As a BIOS upgrade chip for advanced features such as support for newer CPU, larger hard drive, more devices and fix for known bugs.

eBay