Hi, so I recently started my new pc build with a ryzen 5900x using this mobo and I need to flash the latest bios for the board to be compatible. I originally put the whole PC together but got Q-Code number 2 on start-up which means "AP initialisation before microcode loading" im relatively sure this was because the cpu wasn't compatible with the current bios but feel free to correct me if wrong.

Now because I don't have another previous gen AM4 CPU im going to need to use the bios flashback tool on my mobo which is fine and dandy but that doesn't appear to work either and there seems to be little to no troubleshooting guides for this dodgy feature online so I came here to ask you good folk if there is anything that im missing here in the flashback process or anything I can try to make it work.

So far I have tried:

• Cleaning the drive and wiping everything on it as per a user guide on the ROG forums to make sure there is nothing left as traditional windows format won't do the job

• Using a usb under 32gb (mine is 8gb) and formatting as fat32

• Downloading the latest bios from the official asus page for my mobo and loaded the renamed .CAP into the root of my usb

• Unplugged and removed absolutely all cables/headers/io connections from the mobo so it was just the 24pin main power on standby and the usb plugged into the "BIOS" labelled USB port on the back

• I then attempted to load the new BIOS onto the mobo by switching the psu on and holding the "BIOS" button for 3 seconds however every single time I try it flashes 3 times and then turns into a solid light that just stays there indicating that it can't read the USB/File?

I don't understand as it seems im meeting all the requirements for this to go smoothly but the board won't detect anything from the USB at all. If anyone could provide a hand I would really really appreciate it as im at a loss for words and I don't know what to do

So for MSI boards I've seen detailled instructions on this subreddit. I'm going to need to use BIOS flashback on my C6H since I have a Zen 2 CPU but and old BIOS. Unfortunately the ASUS instructions are very rudimentary.

It does nowhere state the prerequisites. Do I need to put in a CPU? Do I need to put in RAM? Do I need to only power ATX or also CPU? What is the sign of a completed flash procedure? And so on :)

Anyone have experience with this?

Hey guys,

I have a question. I'm trying to update my Bios for my ROG CROSSHAIR VIII HERO to install an AMD 5800X3D.

My CURRENT Bios version is: American Megatrends Inc. 2103, 6/19/2020

I'm aware that I need to update my bios. However, do I need to download and install EACH UPDATE of Bios until I reach the current update? OR am I fine to just go to the most recent Bios update and just install that?

Hi, I tried r/techssupport but no response there, so I try my luck here.

My setup is using a 2700X ryzen atm, but I bought an 3900X and while waiting for it to arrive I tought I'd upgrade my BIOS to support my incoming cpu.

So I downloaded from asus the latest 2901 bios, formatted a USB stick using Fat32.Then used the renamer tool to rename bios file to C7H.CAP, trasferred the bios file.Powered off my computer, then sticking the pen into usb slot marked BIOS.

Held the flashback button for 3 seconds until it started blinking blue, and usb sick indicates it's being read from.

Waiting until led on motherboard goes off, then for safety waited some more just to be certain.

Removed the stick and pressed the power button, then nothing :P

Tried powered it completely off then on, but still nothing.

Onboard Start switch lights ut, and RGB leds are flowing trough all colors. But nothing happens when I press start.

I've tried several usb sticks, several different version of bios. Even tried clear CMOS button. But nothing seems to help.

So, my question. Anyone got some good ideas? Or should I just go ahead and order me a 570 motherboard?

Just in case anyone was thinking of upgrading their am4 crosshair viii dark hero board to bios 4805 that released a few days ago, it breaks the ability to control the board LEDs such that ‘off’, ‘black’, ‘dark’, etc. is bright green. Breaks any aura designs you have that include the board. A few stock ones work but almost everything resolves to static bright green.

I downgraded back to 4702 and the issue was completely resolved. Just wanted to post it because I didn’t see anyone else who struggles with obsessive compulsive tendencies post about it on any of the boards I read.

I hope this helps someone