BMW Repair Questions? Ask a Mechanic for Answers ASAP
unfortunately there isn't a simple answer here
you can try pounding with a fist inside and outside of the door as you attempt to open to see if anything will free up
if not, you will need to fight the panel off or partially off with the door closed
this isn't easy so it might be worth having it done professionally to minimize damage
if you prefer to try yourself be sure to put the seat back as far as possible to give yourself as much room as possible to work
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