Two ways, put the install CD/DVD that came with the system into a CD/DVD drive connected to the board and try starting it up and letting it run. If you have a case speaker you can connect, put it on there too so you can hear. Crash Free makes 2 short "beeps" sound indicating that the BIOS file is recognized. If you hear 5 short "beeps", it mean no BIOS file is found/wrong format etc) If you hear the 2 beeps, this wait at least 4-5 minutes before restarting.
Or you can also put BIOS File on FAT32 USB Stick and connect to the black USB Ports. Small cheap USB (128MB-2GB) work much better than large USB drives
If you use USB Method,
rename the BIOS to AM1IA.CAP, this is the recovery name of the BIOS it will look for on USB
Also, if you use VGA/D-Sub sometimes you can see crash free info on screen
Video example shown below at post #5
https://www.techpowerup.com/forums/threa...-3.243686/
https://www.youtube.com/watch?v=LirQ-oM9XBI
If you still cannot get it, you'll need to order a flash programmer and chip extractor, these are cheap.
CH341A Flash programmer $2.58 -
https://www.ebay.com/itm/201596100116
Chip Extractor $1 -
https://www.ebay.com/itm/123167465408
Here is software package for programmer, many versions inside and main driver installer
If you end up getting this, before you write anything to the chip get a verified and valid backup made with the programmer, otherwise you will loose your board details (Serial, UUID, LAN MAC ID etc). Programmer will say "Chip and Buffer match" means verified, but you still need to check via hex or other methods if this is a valid BIOS backup or all FF's or 00's, if/when that happens you need to try again with different software version until you get a verified and valid backup. Once you have that, you can write to the chip, but you cannot write BIOS from Asus download, , you need to extract the .rom/.bin from the .cap (Capsule) first from of the Asus downloads. That is done with UEIFTool, right click on capsule and choose extract body, or via hex by removing the first 2KB (800h)
If it comes to that, message here or PM me when you get the programmer I will help you get it all sorted out.