If somebody have courage and like to try convert nuvi 3590 to 3597, here is procedure:

1.) Download pack

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2.) Connect nuvi to PC and rename folder text, voice, keyboard

3.) Clear non vol and in pre boot drag/drop nuvi35x7_GCDFile__260.rgn on updater and flash

4.) if something go wrong download this pack to go back to nuvi 3590 FW (drag/drop in pre boot on updater)

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You do this at your own risk