Followed software instructions to the tee, at approx step 4 of 6 (upgrading GPS) and about four hours into the process problems started. Screen went blank, car lights started flashing and message on instrument panel said "stop car and check break problems". Car would not shut off and lights kept flashing, eventually I placed FOB over start button and was able to turn off vehicle. Tried starting car again and had no luck, received break message again and now car is being towed to agency.