Comment by Nextgrid

So the screen can ask for the programming data to be entered or loaded from a USB stick given to you when you buy the vehicle. There’s no reason this can only be done with a proprietary tool you often can’t get legally at all and have to resort to piracy or reverse-engineered aftermarket options. There’s also no reason this can only be done once and then the module is junk.

Hardware differences can be autodetected in some cases.