If, previously, you have disabled “show VIN in menu” (because Carson’s activator) you can enable again following the next steps:

Note:For more about Professional Diagnostic Tool Audi MMI Repair articles,please check:Audi MMI Repair

Open Green Menu:
MMI 2G      SETUP + CAR
MMI 3G      SETUP + CAR
MMI 3GP   CAR + MENU
RMC           CAR + MENU
MIB            Not available

Go to car/carextdevicelist and check “VIN”

Go back (click in …)
Go to car/carmenuoperation
Scroll down to VIN and set VIN value to “5”

Exit from Green Menu with the CAR button.
Reboot Your MMI
MMI 2G                      SETUP + Main (Big) Button + Top Right Button
MMI 2G (A8)             TEL + Main (Big) Button + Top Right Button
MMI 3G                       SETUP + Main (Big) Button + Top Right Button
MMI 3GP                    MENU + Main (Big) Button + Top Right Button
MMI 3GP (A1)           TONE + Main (Big) Button + Top Right Button
RMC (A1/Q3)             BACK + Main (Big) Button + Top Right Button
RMC (A6/A7)             MENU + Main (Big) Button + Top Right Button
MIB                              MENU + Main (Big) Button + Top Right Button