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I have had 2 successful flashes since I built my test bench setup to flash outside the car. Seems like that is the way to go
Can you post a schematic of what you built? I agree, I think it's the way to go, safest for sure. I don't flash often because of the risk, but if I had a bench setup I may "play" some more.
I am also very interested in a schematic of your setup.
I am using TunerCAT and built a cable for reading/programming myself. I got a Checksum error on the first read. The second one finished successfully.
Now I am not so confident of programming it and would really appreciate a safer setup to do so.