u/Interesting-Lunch542

Hey guys.

I have a 2021 S5, been running stage 2 ecu tcu for a while and few days ago I wanted to reflash my tcu so I can select the rolling amax.

The flash failed and now my car won’t flash anything transmission related. Ecu flashes no problem. I used battery charger, hood open, with hazards on. Nothing works. I never had an issue ever flashing TCU but now it fails either at 0% or at 49%.

What to do?