The newer models with encrypted firmware cannot be 'patched' and will not allow the usage of unlocked commercial maps.
The Montana 700 series & Zumo XT, both with 5 inch screen size are two such models, not sure about any others.
I'm guessing the 7 inch Overlander and the 5.5 inch Tread being fairly new will also have encrypted firmware.
Purchased maps on USB can be swapped from one device to another but can't be used on 2 devices at the same time.
They still allow custom maps as I use Shonky Maps without issues on my 700, will I did until I sent it back for repair/replacement anyway.
Custom waypoints saved as a .gpx file work fine on a 700, not sure about custom speecam files as I don't use them.
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