Let me say something about my navis for a better understanding, hoping this will clarify some confusion
At the beginning I had a 3790 with a broken display.
Via Ebay I bought a working 3750 (~40$) and used its display as a substitute for my 3790, so a 3750 without display remains
Also via Ebay I purchased a working 3760 (~60$) and was looking for a way to use ASR and other features, I found this forum and converted it to a 3490.
Now, with the help of lolypop000 I'm trying to change UnitID to have LMT (I got the UnitID of a real 3490LMT).
The question of changing the displayed model type at startup was only inspired by my ambition, it's not really necessary.
But having a useless 3750 I can do some experiments before trying to patch the converted 3760. If the 3750 is gonna bricked it won't be a big loss...