One of the many issues that I had with memory cards was retrieving the password from PGM4 units that had no cards at all, altering mileage, etc. Even though I solved these issues, I still wasn't satisfied.
I thought that if it's possible to match a memory card to a PGM4 unit, why not go a bit more advanced and match the PGM to the memory card? So let's assume that I have two PGM4 units with only a single card; why not use it to unlock both? If I have a PGM4 unit with 3 memory cards and a second spare PGM4 unit with 2 cards, why not use all 5 cards on both units?
And my assumption was correct; memory card matching is not the only option, but PGM4 matching is also possible. I'm not sure if this was done in the past or if it's helpful, but I was intrigued to try anyway.
For example, the PGM4 unit that I bought had no cards at all. But I also have here a second PGM4 unit that belongs to Tom (UK) and is in perfect working order, and I didn't want to mess with it.
So, I did the opposite job. I internally matched my PGM4 to Tom's unit. This means that now Tom's memory cards also unlock my own PGM4 unit. Neat and easily reversible!
While I was there, I also altered mileage.
TRIP : current year
TOTAL : current date (sorry, not enough digits on the LCD, so let's assume it says 25/1/26) 🙂
Have fun.
Nick
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