Hello Neil, I have taken a trip and I have tried the nüvi converted to 34xx, I don't dislike it, it has worked quite well. The DEM map has worked correctly, the 3D map too but the JVC intersection view has not worked at any of the highway exits.

Quote Originally Posted by Neil View Post
As far as i'm aware there's no specific thread but you can search generally for "Convert 3790 US/EU to SG/MY", maybe there's something from years back. I seriously don't recommend that conversion unless you have a deep understanding of the various files specific for both devices. Otherwise, the safest way is to do a hybrid-conversion after removing all region-specific files then painstakingly gradually add files back individually and power it on each time to see if it soft-bricks.
Thanks for all your support. I will not do the transformation to SG/MY at the moment. If I decide to try it, I will do it as you tell me and I will surely ask you things before I start. Thank you very much for your advice.

Quote Originally Posted by Neil View Post
As for a 3490 conversion, with the correct Voice Command related files (ASR2 only) and a full NTU EU map the voice command function should work. The map (NT or NTU) you have on-board can be checked via "My Maps" in settings; or connecting to a computer and looking at the content of GarminDevice.xml file found in the Garmin folder.
I have the original maps that my nüvi 3790 had installed, along with an update that I did in 2011, copied to a backup that I made after recovering the nüvi with Cure3. Once it started with Cure 3 and the original file, it went from 3790 to 37xx. At this point, I started testing maps from different sources. In the end I installed an unlocked Garmin map that I found on the web along with additional ASR, SQLITE, SDI and JVC files. This map is the one I have installed and the one I show you in the following image. With this map, and the nuvi as 34xx (not as 3490), the cross view (JVC) has not worked and the voice commands do not work either.

Spoiler: [url=https://postimages.org/
Mapa 1[/url]]


When I installed this map on the nüvi 37xx, I connected the nüvi to Garmin Express (via USB pretending it was the nüvi 37xx) and Garmin Express updated the maps. Today, and installed those maps and the files that were updated (a JVC file and some other files) on the nüvi 34xx, they are the maps that I show you in the following photo. Voice commands do not work with these maps either, I have carried out the test with all the ASR files that I had from the web download, and I have also tested it without these, only leaving the original ASR files.
Tomorrow I will try to test if the crossover view (JVC) works well.

Spoiler: [url=https://postimages.org/
Mapa 2[/url]]


Quote Originally Posted by Neil View Post
Unfortunately Garmin device regions cannot be accessed by a computer in that way, other than of course the file system region (either 48 or 83) which has format of FAT32 and is therefore visible, writable etc. and can additionally be formatted and checked by ALL the usual tools just like any other USB flash drive can be treated, including using CHKDISK etc.. All other populated regions are effectively invisible to a computer.

The only way to 'see' the content of region 41 is to firstly decrypt a dumped BIN file copy of it (unlike other regions, nonvol is encrypted). We then can look at it's data in a hex editor. There's little practical value in doing that usually anyway - if you did know what data to remove, replace or add, then after making changes you re-encrypt it's data and manage to flash it back it to a healthy device the nonvol just gets updated/rewritten again on the next boot-cycle. I don't think your faulty device can even access rgn41 regardless, because it can't be erased using "ergn,41" text command. - that's essentially why it can't be restored as US/EU 3790.

You are a crack! I have now perfectly understood the problem, thanks to all your explanations, and it is clear to me that my nüvi will never be able to be a 3790 again, unless Garmin wants to repair it.
Let's see if little by little we can get the JVC and voice commands to work well, it would be a real pleasure for me.


A hug.