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My understanding is that if your Boxster has the fourth steering column stalk to access the OBC (on board computer), then you can change the clock back to a 12 hour format by yourself.
If you have no access to the OBC, then a PST2 (or PIWIS tester) is required to set it back to a 12 hour format. A Porsche dealer can certainly perform this service, at a cost (usually outrageous), or an indie shop should do it much cheaper. In fact, if you have a good relationship with your indie, he just may do it for free.
Just sayin'...........
TO
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