I think what has happened now is, you've tried to enter the code(probably the wrong code) too many times.....now to get it off of the wait screen i believe you have to put the key in position 1 for awhile(up to several hours) for the radio to clear itself...then the radio will have to come out like I've explained previously, and the serial number written down so you can call MB dealer and obtain the correct code...good luck Bob
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