Here is the link to the firmware version that works on my 2020 ST:
https://github.com/ludwig-v/wireles...mware/U2W_Update_2020.08.04.1602_ROLLBACK.img
Click the download button and save the file as : "U2W_Update" (Exactly as I typed, no quotes)
Erase and format a USB drive (I used a 4GB) using FAT32 formatting. Copy the above file to the newly formatted drive (make sure it is the only file on the drive)
plug the USB drive into the CarPlay2Air dongle
plug the dongle into a USB power adapter (I use the one that came with my iPhone) and plug into a household 110 outlet.
Your CarPlay2Air will display a red solid light, then flashing blue and red lights while it updates. Give it about 3 minutes, but make sure the lights are done blinking..
Remove drive and plug the CarPlay2Air into your ST USB drive. Should work perfectly now! Good luck!