Thread: Garmin nüvi 2597LMT wont accept unlocked maps

ohlwfjuy, read carefully [Only registered and activated users can see links. ].
If HWID=1582 downgrade ( or upgrade ) f.w. to [Only registered and activated users can see links. ]

Thank you both but how do I downgrade to version 460? Right now it's running 770 and I followed [Only registered and activated users can see links. ] but failed:

I dragged nuvi2xx7and2xx8_GCDFile__460.gcd into WebUpdater and it ran but when I restarted the garmin I didn't see firmware upgrade progress and the GarminDevice showed 770 still.