[Only registered and activated users can see links. ] explains the basic 3 steps you need to do for ALL/ANY "old" what they call a NAV2 device plus many more How-to's here [Only registered and activated users can see links. ]
This entire forum is generally all about getting the latest maps on these non-TT-supported NAV2 devices (incl yours)
Unfurtunately the other forum (gpsurl) is currently having technical problems but will be back (hopefully) soon
Alternatively just google around & you'll find numerous other forums to try
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