Automatic Shift Software: Change or Fix?

Hi,
I had a small performance upgrade done on my car, increasing the horsepower from 130 to 150.
Since then, the automatic transmission has been behaving completely nonsensically (yes, I know VAG can't program ). Which software would be best for modifying the software?
Or would it be better to just stay away from it altogether?

Hi,
Do you have a tuning module installed in your car? Which one?

The engine control unit (ECU) is a generic model and doesn't have TÜV approval because there's no certification available for the performance increase of 25 horsepower.
However, it was a good deal at €250.

You can find more information at the link in my signature.