Try this on your bricked unit.
1. With your truck on and wireless CarPlay running search 192.168.50.2 it should show you the firmware update to 8-4-20 on your phone. Keep this page open.
2. Connect the bricked unit to the wall power brick.
3. Connect a iPhone/iPad lightning cord to the bricked unit.
4. Connect your phone to the lightning cord.
5. Now press the update firmware tab on safari on your iPhone screen and let it go through the process.
6. This worked for me on my Carlinkit usb-c once when I couldn’t get it to do anything.
Hi 2019 Denali, thanks for this amazing tip. I just tired it out. I also have 2x adapters so this was do-able for me. First i downgraded to 08-04, but then my iphone could not find the adapter. I therefore upgraded to 2020.09.17. Finally it suggested an OTA upgrade after that.
The upgrade starts after following your list, but it stops at 4%. The iPhone does not connect or start charging at any point.
My setup is like this:
USB-C iPad wall charger, usb c cabel from the wall charger to the adapter, then i use a iphone usb-a to lightning cable from the other side of the adapter to the iphone.
Any suggestions? Theres alot of newer firmwares available. I just tried to find one old enaugh to launch an OTA upgrade.