Another thing nobody seems to talk about with these newer Schindler controllers is how sensitive they are to voltage dips from the building's backup generator. We had a job where the door lock timing was drifting on the 8th floor only during generator tests on Tuesday mornings. Turned out the generator kicking on was causing a 2 volt sag that was just enough to mess with the controller's timing circuit. The main power was fine, but that backup line was a total nightmare. Nobody ever checks that.

Feel for you man, that's a brutal break.

Oh man, that's a rough way to spend an afternoon. I've been there - once I bricked a panel so bad I had to explain to the customer that their alarm was basically a really expensive paperweight for a day. At least you got it back to the programming menu, that's better than I did on my first botched firmware job. Sounds like you had to pull the battery and power cycle it a few times too, did you end up having to reload the firmware from scratch or did it eventually sort itself out?