Sadly on the boxer or any other Porsche you will have to visit the dealer or a good
locksmith for automotive locks and remotes repairs .
The key fob will have to be reprogrammed as the battery went flat .
Here is a lick click here
Get in touch with these people i'm sure they will be able to help you and a lot cheaper than going to the dealer .
Please rate my help a good to excellent if you are satisfied .
If not ready to rate don't rate poor or bad service as we can continue to work on this issue or I can opt out and recommend another expert .
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If I don't reply soon I will as quickly as I can when i get back on line.
Kind regards Greg