Try disconnecting the negative battery cable from the battery. Then touch the negative cable you took off to the positive cable for a few seconds and then put the negative cable back on the negative post. This will completely discharge power.

Once its reconnected see if the inner or outer door handle works.

Its possible that may do it. I never tried that but the way bmw's handle wrecks it may work. The positive explosive bolt kills power from certain parts of the car in a wreck and its supposed to unlock the double lock from what I remember.

Again its worth a shot before going at the door panel with the door closed.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install