I've got the same problem as above. Tried pulling my parking break, pressing down on the break itself, etc. Nothing seemed to work.
I'm going back to the installers tomorrow regardless but I just wanted to know if there was anyway to figure it out as well.
Also, the rear view camera isn't working either. Obviously I can't troubleshoot the settings but while I was on this post I thought I'd bring it up as well. Thanks y'all.