Public Service Announcement (PSA): Posting this in the hopes it helps others. I spent over two hours trying to get Q-Flash Plus (QFP) to work; failed! You are welcome to still try to get QFP to work, but I would suggest not spending more than 30min on it. If it doesn't work with a couple of USB 2.0 drives, keep reading for the other option. It worked for me, and maybe it'll work for you. I think QFP is a finicky, dubious feature that is hit-or-miss. It seems to work if you have the right type of ancient USB 2.0 flash drive. A few people posted links in the below references (bottom of my post) about a specific brand/model that worked for them, but I didn't want to order & wait for yet another thing in the mail.

BTW, if you'd like to try QFP this is a great reference. This is well explained and it seems simple, which made it all the more frustrating that this didn't work for me. I have experience building PCs, so to follow a simple process and NOT have it work, is very, very annoying. But the video is well done and easy to understand:

https://glennsqlperformance.com/2020/12/22/how-to-flash-a-gigabyte-motherboard-with-q-flash-plus/

I can't take credit for the workaround, as I learned it from another Reddit post. Here's the trick: Just configure the motherboard (build the PC) and try to boot it. Add your CPU, RAM, video card, etc. then connect your power supply to the motherboard. Then hook up the video card to a monitor, power the PC on and hopefully it will at least post (power-on self test) and let you boot into BIOS (just press DELETE key repeatedly when powering up the PC and odds are good you'll get into the BIOS). If so, congrats! You can now use the regular Q-Flash (within the Gigabyte BIOS) to upgrade the BIOS to a more recent version. You can even use the same USB stick you prepared to use for Q-Flash Plus.. Magically the USB drive is readable now, even though it didn't work when you tried to use it with Q-Flash Plus.

The above trick worked for me. I recently got a Gigabyte motherboard (B550 Aorus Elite v1.0; who names these things...) as part of a new computer build for an AMD Ryzen 7 5800X CPU. I picked this board specifically for its Q-Flash Plus feature, which is advertised as allowing you to flash (upgrade) the BIOS without needing to have CPU/etc installed. I thought this would be great, since I don't have a Gen-3 CPU on hand (and I thought this was all the board is compatible with out of the box, until you flash it to a higher version of BIOS that supports Ryzen 5000 series CPUs). The sticker on the motherboard box proclaims "3rd Gen Ryzen Desktop Ready" but nothing about Ryzen 5000, so I thought I had to QFP to get this to work. Fortunately, when I followed the trick above, I was able to get into the BIOS and saw it had BIOS firmware version F11 installed. I used Q-Flash within the BIOS to browse to the USB I had plugged in (ironically, to the same dumb "BIOS" USB port, which failed to do anything when I tried to QFP) to upgrade to the latest firmware available for the motherboard I bought (F14c, released 09/06/21, 6 days ago). Rebooted and the PC still boots OK, so looks like the BIOS was successfully updated (confirmed in BIOS it recognizes the CPU, memory, etc & the BIOS version is F14c). Yay.

The strange thing about the F11 BIOS, is that you cannot download this version for this motherboard from Gigabyte's website. Here is the link; if you go there, you'll see F11 version isn't available for download: https://www.gigabyte.com/Motherboard/B550-AORUS-ELITE-rev-10/support#support-dl-bios. Looks like Gigabyte did an internal release of this BIOS to boards, to give them Ryzen 5000 capability (to allow them to boot up, at least). Version F10 is when Ryzen 5000 support was added for this motherboard, so I thought that was an interesting discovery.

If that didn't work, I would have probably had to get a Gen-3 CPU somewhere, as I really didn't want to send back the motherboard and get another one which may or may not allow me to flash it without CPU/etc. attached. So if QFP doesn't work for you, hopefully you'll be able to boot the PC like I did & update the BIOS via the regular Q-Flash method within the BIOS.

For reference, here are some other posts of folks having issues. I probably spent almost an hour of time reading every single post, hoping to learn the secret trick to getting this damn QFP to work. One recurrent theme I saw in the posts was that folks opened support tickets with Gigabyte and got crappy replies; basically just telling folks to "follow the directions" or suggesting that they RMA the board and get another one. Ugh! Hopefully nothing ever goes wrong with this motherboard, because it sounds like customer support is horrendous. Good luck everyone!

https://www.reddit.com/r/gigabyte/comments/nz31jv/b550_aorus_elite_ax_v2_cant_flash_bios/

https://www.reddit.com/r/gigabyte/comments/kazqli/yet_again_someone_else_who_cant_flash_their_bios/

https://www.reddit.com/r/gigabyte/comments/k4nnoh/q_flash_plus_not_working_on_three_gigabyte_b550i/

https://www.reddit.com/r/gigabyte/comments/k6694v/possible_qflash_plus_fix_b550_aorus_elite5600x/