Thread: Transform a Nuvi 37xx in a Nuvi 34xx for dummies

If your 3670t has small internal memory like mine (1,72 Gb) you cannot have both InstaSearch (SID folder) and voiceCommand (ASR folder) at the same time.
Erase all the voices from VOICE folder that you don't need.
Do the same from KEYBOARDS folder, to free some space.

Go in Hidden and Protected System folder .SYSTEM and erase any previous JCV folder.
On sdCard create folder \GARMIN and copy inside the new JCV folder ([Only registered and activated users can see links. ]).
On sdCard, in MAP folder copy the map of USA (gmapprom.img), 3d-Buildings (Gmap3d.img) and 3d-Terrain ([Only registered and activated users can see links. ]) for USA.

On device, in GARMIN folder copy the attached files from post#1 to enable all features and restart Nuvi.
In .SYSTEM folder create ASR folder and SID folder.
Copy from [Only registered and activated users can see links. ] the sid files.

If you want to try VoiceCommand, connect with WebUpdater and choose to install additionaly only US voice commands (en_US.srd)
Don't install other Voices or Keyboards that you erased previously.
Because you don't have enough space on device, move now the ASR folder to sdCard\GARMIN\ASR and copy in there the needed ASR files from [Only registered and activated users can see links. ]

If the VoiceCommand dosen't work from the sdCard, move the SID folder from the device to the sdCard\GARMIN and move back on device, in .SYSTEM\ASR the ASR folder.

I don't have VoiceCommand in my language, so I keep SID in my device.

On device, in .SYSTEM\SQlite folder copy D3397020A.DB file and not any other ****.DB or ****.G2S files because they are for other devices.

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If your 3760 came with USA maps preinstalled, then you have all the space you need on device.
Just erase the old files from .SYSTEM and replace them with the new ones:
gmapprom.img, Gmap3d.img, gmaptz.img, JCV folder, ASR folder as above (different files for 34xx) and create the SID folder as above.
The gmapDEM.img is the same.
Again, in device, in .SYSTEM\SQlite folder copy the new D3397020A.DB file and not any other ****.DB or ****.G2S files because they are for other devices.