- Doesn't need to be bootable
- You want it to be formatted to FAT32 or large FAT. I use rufus if Windows only wants to do NTFS. This is an issue with larger flash drives. Some BIOS have issue reading anything that isn't FAT32 or large FAT. FAT64 also doesn't work sometimes nor NTFS.
1. Download the latest BIOS file from your motherboard page.
2. Put the file on your flash drive
3. Reboot the PC, get into your BIOS settings
4. Using the BIOS update utility ( name varies from motherboard to motherboard, on ASUS it's called EZ flash), load up the utility and select the BIOS file from the flash drive. Confirm and let it do the update.
5. Do not interrupt the update or it can brick your motherboard. It will tell you when it's done or may restart.
If you cant find the flash tool in BIOS if you give your motherboard name we can look it up.