@Catmag: ok I did do the 37xx flash and then the convert37x34 from SD card. But this give me the 37xx nuvi not 3450. When i flash the 34xx firmware, it give enable all feature. I still can't disable those extra feature and I can't return to Garmin when the look on the screen is 37xx or 34xx with all feature enabled.
so i try copy these file to Garmin folder, restart, but no luck in disable those extra feature
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