Hey all, I found this thread while searching for that really annoying rev hang issue on my '19 GTI PP (EU). I'm pretty new to this whole ECU flashing topic, but I'd like to share my experiences so far and I also have some questions:
The Macchina A0 hasn't been obtainable since I'm looking for it and the OpenPort is pretty expensive. So, I built the aforementioned AMAleg DIY clone with an ESP32 lying around from a pretty similar project (motorcycle gear indicator/data monitor based on k-line/Bluetooth/Android app, it's on GitHub as well if someone is interested). Then I flashed the isotp-ble-bridge firmware and it just worked like a charm with both Simos Tools and VW_Flash.
Now I'm at the point where I need the flash files. AFAIK I need FL_5G0906259Q__0005.frf (SCG bootloader -> Simos 18.10) and FL_5G0906259S__0003.frf (Spare part no: 5G0906259S, Version: 0003). I also found information about FL_5G0906259T__0003.frf, which seems to be a newer version, but I want to avoid any interoperability problems and be able to go back to the original state any time. Additionally, I believe I also need a definition file for it.
I found shops selling single frf files, others selling whole odis firmware packages and some people say that there were/are downloads directly from VW/erWin, but not anymore. What's the best way to get these files? Which of them are trustworthy?
Next step would be to fire up Tuner Pro.
I would appreciate it very much if you could you give some hints regarding this (besides being a single table/5-minute fix).
Big thanks to all people involved here, driving this awesome open-source project forward.