2 things to keep in mind for anyone having this problem even after doing the above.
The extracted files need to be directly in the flash drive. they cannot be in a folder in the flashdrive. i.e. if the zip folder gets extracted to a folder called ‘framework_bios’ you should move the contents of that folder to the flash drive.
You should unplug any unused expansion cards. I specifically had a problem with my hdmi expansion card, but you may also have that issue with others (usb-c and usb-a are probably fine though, and obviously you need at least one of those to actually plug the drive in)
I saw in the bios that the hdmi card was appearing under usb devices in the boot menu which I though was odd, and sure enough removing it got the flash drive to show up