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Hi, welcome to Just Answer. My name is***** the negative battery cable on the battery in the trunk for 30 minutes and it should reboot the radio.
Let me know if it works.
Hi, just checking in. Did you get the radio working with the reboot?
Ok, if your charging system and battery is good you will need to get the car connected to the Mercedes factory tester to reset the COMAND unit and update the software. If that does not solve the issue you will probably need to replace the COMAND unit or send it away for repair. The software update often helps.
I understand, and I wish I could do more. Unfortunately this is one that needs to go to the Mercedes service center.