AHC will be from S8. I tried on mine and it's the same- can change with ESP or without but not to manual. Maybe because TCU is still connected and communicating with ECU. Or maybe if it is early S8 like mine and manual was only introduced later there will be no coding for manual on early S8 examples until they actually started making manual.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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