BMW Repair Questions? Ask a Mechanic for Answers ASAP
what is the part # XXXXX what was installed?
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unfortunately there isn't a lot you can try in this case. something has gone wrong with the install
unhook the battery for an hour, try a jump start, try a second key, try locking/unlocking the door manually a few times
if that does not work then you likely have a CAS (car access system) or power distribution fault which will require proper diagnostics as well as parts replmacement and/or programming to rectify
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