[pupu144]

What software you've used to read the data of your current HW and SW?
Official manufacturers software works with numerical "calibrations" for ECU software. This is exactly what you saw at the link I gave you.

I don't think you need to go to dealers with such old vehicle. Better ask you local car community - someone might have a "Opel GlobalTIS v32" with an offline SPS (software update).

It will end up MUCH cheaper than going to a dealer (might cost you a pack of beers, but depends on technicians greediness).
Because at dealership, it will cost you 60 eur to only connect to Opel servers which check and provide software update files, also add labor cost too.

P.S. if you do end up at the dealership - ask them to update ALL the modules. Because you will be paying that 60 eur reprog fee no matter how many modules you update during the single session.