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

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Works for me, I attach the file here, use FF , IE8 has problems with our server-

To make a backup , enable hidden files in Windows and copy the whole content (.System included) of your nuvi to pc.It should be better to backup your NV too.
See this thread:
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To make the NV backup with sd:
(Important note :NV backup is not the backup of files of Nuvi, but the NonVol memory backup,it contains Nuvi ID, all your maps codes, probably your Nuvi registration date on myGarmin and first satellite fix etc. Everything is in reg 41,all in these few bytes. NV backup is your nuvi "personal" backup ,dont share it on public forums or you can risk someone clone it)

Spoiler: CLICK

1-Create a "Garmin" folder in an empty sd.
2-In Garmin directory create a directory named "Updater".
3-In Updater create a directory named as your nuvi HWID number, it must be 4 digits eg: 0971
4-In the above folder copy Ldr.bin . What is Ldr.bin? It is your firmware boot.bin you can extract with RGN_tool

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and rename it as Ldr.bin.
5-So copy it in "XXXX" (nuvi HWID) folder along an update.txt made with notepad where you'll write this command :

rrgn,41,1:/41_backup.bin
reboot

6-Insert the sd in your nuvi, you'll see at boot a software loading message and nuvi will write your NV backup in sd, let it reboot, shut it down, remove the sd and keep your Nuvi NV backup in a safe place.

To restore it replace command with:
xrgn,41,1:/41.bin
reboot