I got a V21 FVDI VAG version for Audi, and wanted to test with my own car the change mileage option. FVDI was able to successfully read the KM, but when it wrote the change, the Instrument Cluster died (got stuck into bootmode). It turned out that FVDI doesn’t handle micronas ICs. and I kown original AVDI is shit for some micronas too…
Got a Digiprog 3 V4.94 odometer correction tool, selected the correct model, changed mileage to the one it had before modifying, and after this operation, the IC was back to life. An extra operation was to remove the DTCs from the IC, but this was done also with digiprog3 mileage programmer.
So, that’s that. I hope this helps someone in the future.
Credit to Bi0H4z4rD who worked out the solution.