I have Asus Maximus Z790 Hero, 13900K CPU and G.Skill 6000 64GB RAM.
I want to update BIOS from 1303 to 1501.
1) Which of these two methods will be safer if I am not sure if the computer is running 100% stable? EZ Flash 3 or BIOS FlashBack?
2) Will the FlashBack method also update the intel ME?
3) Do I need a USB 2.0 flash drive? Will a USB 3.0 flash drive work?
4) Should I press the "Clear CMOS button" before and/or after doing the FlashBack method?
1) Either method is safe to use. If using bios flashback, rename the bios file using the bios renamer tool or rename it manually to MZ790H.CAP
2) Yes, updating the bios also updates the ME driver.
3) A usb 2.0 or 3.0 flash drive will work, make sure it's formatted to the FAT32 file system.
4) It's a good idea to reset the bios to defaults to ensure all goes well with the update.
I prefer EZ Flash 3 myself - it's just easier because I don't have to reach around to the back of the PC where I can't see properly. Last time I tried a BIOS update I placed the file in the root of the C drive. It also worked fine and I've heard other people say the same. Previously I've always used a USB drive.
It's also a good idea to at least turn off XMP before flashing and also set your BIOS to defaults. It will be reset after the update anyway, but this should give maximum stability for the update process. Any RAM instability during the update could cause all sorts of problems. Very rare, and I always forget to do it myself, but good practice.