This might be the case for newer nearly-classics but the GTE LE jetronic control module doesn’t have software as such. It’s an analogue unit. Sadly Bosch didn’t leave identifiable numbers on the main integrated circuit on a couple I’ve had in bits or I’d have tried swapping out the silicone to see.
As far as the unit as a whole goes, we don’t have the info suitably presented to make it easy to systematically prove or disprove the elements. I’ve gathered a number of articles but haven’t tried to summarise into a manta-esque flowchart. There are still enough “ecu’s” around that nobody is stuck yet.
I do wonder whether folks would rather look at a diy thing based on something like a raspberry pie or update to a modern aftermarket system with accurate timing & sensors. I guess time will tell.
Another member was talking about alternative systems earlier this year but seems to be busy with more pressing mods to his cars.