Tried to upgrade firmware.
During upgrade, device stuck in rebooting for more then an hour.
Finally, I can't communicate with device.
Upon start power green/red light toggles and all lights turn off later.
I guess I need factory reset.
Same issue here. Havent used it for a while, set it up tested, calibrated and it worked fine. I decided to upgrade the firmware and now it connects to everything but no power. After back and forth to Garmin, where their only suggestion was telling me to turn it off for 30 mins and try again, they tell me ill need to pay £221.58 to get a replacement because its out of warranty. Its not really acceptable.