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

**catymag** · 30th December 2014, 04:30 PM

Originally Posted by Alfiogigio

Now I got problems getting into pre-boot mode Again for flashing logo with 34xx_350_logo_hid1376.rgn,
I try many many times with no luck.

Hi,
you missed probably this in OP:
Go to MTP Settings and set it to Mass storage mode.
Setting it to Storage mode you'll be able to flash the new 34xx logo in preboot mode with updater.

Could it be possible to flash 34xx logo and enable all features via sd Card ?

Thanks in advance.

Read at: CURRENT METHOD: Another way to convert 34xx with logo and enable features
convert37x34.zip (911 KB)
(bottom of the page)

**Alfiogigio** · 30th December 2014, 04:54 PM

Thanks Catymag, for fast reply as usual.

I have set device to Mass storage mode, after clearing NV several times.
Allready downloaded convert37x34.zip, but I was not sure if this could be done,
after flashing with RGN Tool.

So just to be 100% sure, now I copy all content from convert37x34.zip,
to an empty sd Card and restart device ?

**catymag** · 30th December 2014, 05:13 PM

Yes, if you have already flashed 34xx fw it's ok:
Unpack the file to an empty SD card, turn nuvi off, insert card, turn nuvi on.
remove sd.
If you want to go back to 37xx:
flash 37xx sw ,insert the sd and you'll return to original 37xx logo and features.

Then don't forget to run Webupdater to get the latest firmware, reset and select Mass Storage in Dev Menu.

**Alfiogigio** · 30th December 2014, 05:40 PM

Thanks Again Catymag.

Everything seems to be working fine now, logo and all features are enabled.
Satellites reception accuracy is Down to 4 meters (was worried about that).

I wish you and all others here, a happy Newyear.

**bpb** · 8th May 2015, 02:05 PM

Nuvi 3770 TH model go 34xx US and can back to TH firmware with a trick.

**Neil** · 9th May 2015, 10:23 PM

@bpb
Be nice if you would tell us the trick please, then we can qualify this warning in the initial post:

Originally Posted by catymag

........
Warning ::
Please don't convert 37xx Asian -->34xx US or you will loose your Asian unit.
(37xx asian ---> 34xx US is an irreversible process !!)

Also if it will work for other Asian fw or just TH?

**bpb** · 10th May 2015, 06:46 AM

Hi Neil, the same way can use to convert the US/EU unit to use Asian firmware. Recent firmware version was not able to convert as stuck with System Software missing.
If really like to try check your PM.

**kevindd992002** · 16th June 2015, 04:46 AM

If I convert my 3790T to a 34xx, should the garmin webupdate program detect that the keyboard software version 2.6 is available? Or is it still 2.9? I noticed that during boot, nuvi 3790 is still displayed even though it already has the 34xx 8.20 firmware version, is this normal?

**Neil** · 16th June 2015, 06:02 AM

3790 and 3490 use same files, except ASR is different. Boot screen on conversions still show as 3790 but it will be recognised as 3490 by Garmin updater programs including for LM maps and will be given all the appropriate updates for 3490.