Hi all, I stumbled across this great thread as I have a Carlinkit 2.0 (detachable USB-C cable version) and can't get it to work properly with my 2016 Mazda 6. It's good, and bad, to see that others are having the same issues, and that some were resolved with firmware updates.
For me, I'm on the latest firmware on the Carlinkit device, my Mazda connect, and iPhone 12 Pro (non beta software). The issue I have is that Carplay will load fine using the dongle, but disconnects after about 20-30 seconds, rebooting the dongle. This process just continues, with the dongle rebooting, connecting, disconnecting, and rebooting. On a couple of occasions, if I leave it plugged in, it will eventually display a fault of : "Hardware Error: BT" as others have had. Though I don't think it's a BT error as it's passed over to WiFi after initial connection from my understanding.
Rolling back the firmware using the web interface doesn't help.
The same thing happens if I use the lightning cable plugged in to the Carlinkit dongle, and it plugged in to the car. Carplay works fine with the cable directly to the car from the phone.
Really hoping they release a firmware version that is compatible with MZD Connect. They claim compatibility for Mazdas after 2018, but as far as I know, they have the same system.