That's unusual that both keys stop working at the same time.
There is a reset procedure posted in here somewhere, I'm not sure it works if they're both bad though.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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