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

Flash full 34xx firmware (This means to use the files on the preceding page and flash them using the Pre-Boot procedure by dropping the file in the Updater?

Yes, exactly. Follow the steps in either Post #1 for flashing the 34 fw, or in Post #184 up to 16 inclusive [with my noted amendments to do NV backups as both 37 & 34].

Next, unpack what files to empty SD card
Unpack the file to an empty SD card, turn nuvi off, insert card, turn nuvi on.
remove sd

The one named 'convert37x34.zip'. There are 3 links there in post #1, all are working.

Does something happen between between "turn nuvi on and remove sd? ....

Yep. The command in the file named 'update.txt' will be executed, this one:
xrgn,16,1:/34/16.bin
xrgn,140,1:/34/140.bin
reboot
What that's doing is telling the nuvi to flash the 34x0 logo contained in 16.bin to region 16 and the modified 140.bin to region 140 to enable the additional features. Just make sure you let it finish, it will only take a little while but that last command 'reboot' means you'll know for sure it's done when the unit starts up again by itself. Then you can remove the microSD.

If you don't actually understand all that at present, don't worry, it's perfectly safe [trust me i'm an Australian, we live with maneating sharks and crocodiles, the most venomous snakes in the world, numerous serial killers and shudder.....Kylie Minogue ... we know how to stay safe .

But do as i said earlier and firstly ensure that all features [especially ASR] are checked in 140.bin [except ecoRoute HD & ecoRoute Purchase] using the Mod3xxx.exe app, and also change the v7.20 Ldr.bin to v7.90. If you are still lost, send me a Private Message and i'll help you further without cluttering the thread. But please have a go first yourself, i'm sure you can do it [i'm 66 and badly brain-damaged from alcohol abuse so if i can do it, then you can too].

@ george
While you have it as a 3790 you could also learn how to do some easy stuff.
Learn how to run commands via SD card.
Learn how to Backup and Restore region 41 NVRAM , 140 Features, 16 Logo.bin (via SDCARD)
Learn how to enable MP3 and Video Player. (Region 140) via SD card.
Learn how to restore logo.bin via updater.exe (pre-boot method)
All the info is available at the Wonderful Noeman.org

George, the problem is that we have to assume that ppl wanting to attempt this sort of flashing have at least a basic knowledge of it. There is a 'Flashing 1.01' level that even proceeds 'Flashing for Dummies', which is why i don't want to do an even more detailed tut than i have. There are already infos in other threads, and its impossible to repeat basic stuff over and over in individual threads. e.g. info on flashing rgn files is available in [Only registered and activated users can see links. ], or how to do an nv back up: [Only registered and activated users can see links. ]. But, we still want to help as much as possible.

Like dasil has suggested, do a bit of experimentation and self-education, all the tools are here on Noeman.
If you get totally lost, then as i've said if you need more help on the basic stuff just send me a PM .

@sempracurtir
1 - See 2.
2 - Some 37x0's suffer inaccuracy after conversion, but they do regain accuracy if re-converted back to 37x0. The following thread is linked in Post #1 here too, you should read it: [Only registered and activated users can see links. ]. Probably due to 2 or 3 different GPS receivers in 37x0, they maybe handle the 34 gps fw relatively better or worse.
3 - Maybe personal likes/dislikes come into this and opinions vary. Most ppl refer the 34 menus and extra features such as Dashboards, Exit Services, Android Smartphone Link. Also you can enable mp3 and video players with 34, can't in 37.

@cz9h3d
G'day. Welcome to Noeman. Seeing you're quoting our good friend George [who finally found the light at the end of the tunnel after a bit of fumbling in the dark], follow what i wrote for him in [Only registered and activated users can see links. ] and you'll be right Mate!