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Interesting VAG-COM codes for Audi A5/A4 B8/Q5, many for A6/A8/Q7 as well (by LoCal) - Audi A6 Q7 A8 A4 A5 Retrofit Jlkiasennus Nachrsten Retro-fit

 

Enabling reverse mirror tilt on cars without memory seats:
[52 Door Elect, Pass]
Long Coding, Byte 4. If the byte has value 40 (cars without electrically folding mirrors), change it to 4C. If the byte has value 50 (cars with folding or folding/dimming mirrors), change it to 5C

Worked on my A5 with folding mirror option and no memory seat BUT .... it didn't really tilt down as far as I would of liked.

Good luck.

 

Thanks for the quick replies!