Installing BMW Alpine Stereo upgrade (BMW 3 series E90)

Loosen front seats

There is no need to completely remove front seats and you should not disconnect any wires under the seats.

First remove 2 x 50” torx screws at the front.

Then remove another 2 x 50” torx screws at the back of the front seat.

Now, simply recline the released seat backwards taking care not to stretch any under-seat cables. Also check where back of the sear rests to avoid scratches from metal rear seat catchers.

Repeat for the other seat.