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

Your nuvi 34xx seems to have HWID 1338, normal 34xx have 1376, to be sure must look at garmindevice.xml
It should support 3D, text to speech and all the features listed there in your above post.
Do you have the right files in it, to show these features up?

Originally Posted by davide87

.................
I can choose these Option in the Settings, but nothing happens.

What exactly are you expecting to 'happen'? These features are common to all 3490 variants including the BMW version which has a Beema logo and Dealer POIs preloaded otherwise it's .... well, it's a 3490 with a different HWID is all. If you have missing features you wish to enable [e.g. ASR, MP3 & Video Player, PhoneLink] then you can dump region 140 and check/uncheck features and flash back. See this thread: [Only registered and activated users can see links. ]. Be sure to use your unit's correct ldr.bin [boot.bin] extracted from the correct HWID [1338?] firmware or you may brick your unit. You can probably cross-flash full HWID 1376 firmware if you want, but first check your PCB P/N is 105-01652. If it's not that number don't try it [but i'm quite sure it will be the same]. To check: Hold Battery symbol on main page for ~6 seconds>Press 'Next'/Lower RH cnr ~9 or 10 times to reach 'Version Information' page, look at 2nd top entry for it.

BTW, you have 3D Terrain & 3D Buildings already enabled, to use them also must have the local DEM map [gmapdem.img] and the gmap3d.img loaded matching your CNNT detail map as said by catymag. As for your linked image in Post #1026, there is a good[*] reason why you're only seeing this:

[*]At this time you aren't in the list of 'likers'. Press 'Like this post' below that list and then F5 to refresh. See my signature below.

Read also this thread to avoid to loose some BMW unit features flashing it to other nuvi software.
[Only registered and activated users can see links. ]

Unfortunately I found there is an important sofware difference I found recently when I upgraded to the 34xx firmware.
Everything works great except that I lost the ability to listen the navigation instruction via my car speakers
I'm sure it's just some settings somewhere but don't know how to enable this feature back.

@davide87
I've never seen an example of your BMW version of 3490. Certainly 3960/3790 Beemer units had a custom cradle which had a wiring harness to connect it to the car's speaker system and perform other functions too. This will be the case if your 3490 version also has that different cradle as catymag has warned above and as i mentioned here:

Originally Posted by Neil

........... Earlier model BMW branded Garmins did have some differences in the cradle for instance. .................

Before you proceed further, you really should determine what you wish to achieve, i.e. if it has a standard cradle and the PCB P/N is 105-01652-00 then you can probably do a straight conversion to 3490 provided you also change the logo [probably]. I say probably, because if your unit has a Splash number other than D3500-00 in Inventory there could be problems if you don't re-flash rgn16 to the usual 3490 logo. In fact even flashing the logo by itself without changing the fw [if it's different] may potentially also cause problems. You can check the logo Splash version in the same hidden menu showing the PCB P/N, on the Version Information page press 'Start Test' then 'More'. At the top of that screen you can confirm that your HWID is 1338 if you haven't already checked it in GarminDevice.xml as suggested by Caty. The numbers following Boot BLK/X-Loader/System will show as 'BXXXX-00' where XXXX is it's HWID.

If it indeed doesn't have a custom cradle but has different hwid to the usual 1376, and you are experienced in firmware modding and further you're confident to proceed without anyone posting to confirm their experience with cross-flashing this unit, my recommendation would be to initially make a hybrid fw from the unit's fw boot.bin and use fw1_resources.bin and fw_all.bin from the standard US/EU fw maintaining the unit's present hwid. If you don't understand any of that then don't do it without asking further.

If you simply want to enable features such as ASR and keep it as a BMW nuvi, then you should proceed as i suggested previously and just attempt to enable features by modding rgn140.

If you need further specific help with either method, post again and we will move these posts to a new or existing thread because either method's OT in here which is for converting 37x0 to 34x0.

@quebec001
37x0 is a 2011 device and came before 34x0 which is 2012 but was based on 37x0 hardware. Once you convert there are also additional features which can be enabled by modding rgn140 which isn't available to 37xx. See also [Only registered and activated users can see links. ].