Are you sure your SIM Card isn't missing? U1A03 means "SIM card is not inserted or unable to be read." I'd make sure the car is shut down, remove the SD card, and reinsert it.
I've gotten that "USB Comm" error already, and it didn't seem to mean anything, but the manual says "It is detected for malfunction of the USB communication module (communication disabled) between TCU and AV control unit", so it could be more serious.
The U1266 means "Malfunction is detected between the AV control unit and TCU", so it could even be a loose connector.
2012 Glacier Pearl SL - Delivered December 8, 2011
10kW Solar PV for recharging!
2006 Prius with Hymotion 5kWh PHEV upgrade
Tesla 70D | Titanium Metallic | Matte Obeche Wood Décor| All Glass Panoramic Roof
Tesla Model 3 Pre-Ordered!