u/NotACreativeUserID

2017 S3.

I opened the rears with VCDS, ended up striping one of the 14mm triple squares because it's pretty seized up. I need to take it to a garage. Piston wasn't in enough, tried resetting the change more and opening again, but the piston came all the way out. VCDS is giving me an error when trying to retract and even with taking the motor off the caliper, I can't figure out how to get this thing back in.

Any advice appreciated.