I had the same ID:4100 error. Quite by accedent, I cleared error. I wanted to recharge the battery, so I pluged the power converter into my car lighter and left in on with the 4100 error for about 30 minutes. I pulled the power plug before shutting the GPS unit off with the on/off switch. I got a message that the unit was doing an auto power off. It then powered down in 10 seconds. When I turned it back on, it worked normally. I don't understand what happened, but this may work for you. Good luck Paul

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