Opel Odometer Adjustment How-To

 You need an ADV Op-Com software and HQ clone (chinese 1.95 works ok). 

First change the firmware to 1.67. 

Than install ADV Opcom (for me works ok 161001a).

Open ADV Opcom.

Click Settings > Change to B+ > Save config

Diagnostic > 2011 > Astra G > Body > Infotainment System > CD300 to correctly initiate the interface as ADV is not made for B+

Back > Choose your car

Go to Body > BCM (Body Control Module) > Programming > Set Odometer 

Change the wanted value and click WRITE

You are done! 

WARNING: The real value will still be stored in ECM!!! Visible in all OBD2 diagnostics! The value is changed only on dashboard!