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

Originally Posted by Neil

If it's the right jcv file [D3191090A.JCV] for the NA 2014.10 map and it must be if it was working before as 3760, then there is no good reason why the exact same map & jcv file won't work with the unit converted to 3490.

Duh....I had the wrong JCV file. I did 2 quick map upgrades to my 3760 - I must have missed the right JCV file when I did it the 2nd time for the 2014.10 maps. I seem to be messing up the simple things now, after getting through the 34xx upgrade relatively easy....

I really appreciate the help of this forum to do the upgrade. I don't miss having a 3597 at all now. And the interface between this and my wife's 2595 are now essentially the same...


One last thing.... I'm not sure whether I'm seeing the 3D topography with the upgrade. I have the 3D buildings showing fine. Is there a good route to check the 3D topography on?

Flash logo over SD.

Got it to work already. I've backread in this thread and the trick was to press over the G logo (for the 3790) just after the backlight appears and NEVER BEFORE it appears.

I think the original issue that caused my 3790 to being bricked is that I accidentally used a USB3 port instead of USB2.

Originally Posted by kevindd992002

Got it to work already. I've backread in this thread and the trick was to press over the G logo (for the 3790) just after the backlight appears and NEVER BEFORE it appears. .....

Use the entire pad of your left thumb to cover the area both on and over the 'G' or where it should be. This is particularly valuable it you don't know whether your unit is flashed as a 34 or 37 or when there is no logo as you had. And you are right about waiting for the unit to come on before pressing. This is not the case with other devices where you hold the upper LH corner before turning on to access pre-boot.

........ I think the original issue that caused my 3790 to being bricked is that I accidentally used a USB3 port instead of USB2.

Maybe, but i've not heard of that and it really does seem unlikely. USB3 ports are backwardly compatible with USB 1 & 2 devices, the same as USB 2 ports are backwardly compatible with USB 1 devices. More likely imo that something simply went wrong with the process the first time

If you have the NA DEM map loaded in your 3490 you will see that there is dem shading overlaying your detail map but just be sure you have it enabled in Map Layers. If you compare the 2595 and the 3490 at the same point on a map [preferably pick someplace rural] then you will see the difference at normal zoom. The 2595 will only display dem shading when zoomed right out and then it's the shading from the basemap which is showing.

Originally Posted by catymag

CURRENT METHOD:Another way to convert 34xx with logo and enable features :

Flash full 34xx firmware
Unpack the file to an empty SD card, turn nuvi off, insert card, turn nuvi on.
remove sd

Download: Udated on 13.10.2012
added Video Player and Premium Point Addressing and updated Ldr.bin

Great work !! I have done this with my 3760 and it works. Thanks.
Now I will try to enable the extra options but is the 'ldr.bin' in the file 'convert37x34v.zip' usable with the newest firmware update (8.1)?

Thanks.
Br, John

Better to use 8.1 ldr.bin
Its easy to get the 8.1 ldr.bin
Open gupdate.gcd (8.1) with RGNTOOL [Only registered and activated users can see links. ]
Save boot.bin to computer.
Rename as ldr.bin. Now you have the new 8.1 ldr.bin

Open gupdate.gcd version 8.1 in RGN_Tool and save the boot.bin as Ldr.bin. Replace the older ldr.bin file with it.

EDIT: Lol! Dasil is the new Speedy Gonzales .... Me =