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Congratulations on the car. Looks very clean.
If none of the buttons work on the remote, but allows the car to start, then it would seem that the electronics connected to the "alarm" portion of the remote has failed. I had a remote that could intermittently lock/unlock the car. The solution was to purchase a new remote from the dealer. If you do some digging, you could probably expect to pay around $300 - $350 for the remote (you can order a remote without the physical key).
Regarding the seat settings, does it change whenever you unlock the car? I believe the vehicle simply remembers the last setting that is associated with the remote being used. There should also be memory settings on the side of the seat. As far as I know, the iDrive plays no role. Neither should the aftermarket Android screen.
Good luck.
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