Removing the sound insulation on the on the center of the firewall upper part

Loosen positive battery cable from the sealing (2) .
Loosen expanding rivet (1) .
Unclip the sealing (2) in the direction of arrow.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen screws (1) .
Thread out the sound insulation (2) .

Courtesy of BMW OF NORTH AMERICA, INC.