Enable 3790 features on your 3750/60

turboccc · Regular Visitor Joined: Jul 01, 2008 Posts: 63

Gentlemen! Today is your lucky day if you have a 3750 or a 3760. I found a way to enable the Contacts, Calendar, 3D Terrain and Building like on the nuvi 3790. ASR appears and is functional on the 3760, but it does not work on the 3750 as there is no microphone installed. See the table below for the list of features that can be enabled for each GPS model per firmware region.

Use RGN_Tool v0.84 to enable those features.

1- Load your firmware in RGN_Tool (gupdate.gcd or a .rgn file)
2- Patch it using the Tools, Nuvi 3790 Patch.
3- Save the modified firmware (I recommend a .rgn)
4- Flash the new firmware using the procedure in the next post.

All previous rules apply before flashing firmware.

Visit my site to get RGN_Tool:
http://turboccc.wikispaces.com/RGN_Tool
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turboccc · Regular Visitor Joined: Jul 01, 2008 Posts: 63

A few more information that you may need:

How to flash the GPS with a new firmware:

1- Drag the new firmware over updater.exe from Garmin
2- Select "USB Device" in the "Connection Settings"
3- Put your GPS 37xx in service/pre-boot mode. See the procedure below.
4- Once the GPS is detected, click OK in updater.exe to start the programming (maintain finger on screen)
5- Once the programming is finished, click OK in updater.exe.
6- Remove USB cable.

How to put your GPS in Service/pre-boot mode

1- Turn off the GPS completely. This requires to click and maintain the power switch for 10 seconds.
2- Turn on your GPS
3- Once you see the Garmin logo, put and maintain your finger above the "G" of Garmin.
4- When you see the scrolling "System" text top-right of your finger, connect the USB cable while maintaining your finger on the screen.
5- Continue to step 4 of the flashing procedure above (click the OK button in updater.exe). Make sure to maintain your finger on the screen while doing this.
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willton · Lifetime Member Joined: Jul 29, 2007 Posts: 150

awesome well done ! How about UK firmware .. will this work ?

turboccc · Regular Visitor Joined: Jul 01, 2008 Posts: 63

Yes. There is not really a UK firmware. It is the same as the US firmware, but with a different Locale that you set on your GPS. So, yes, it will work. Follow the procedure with your firmware and you will have the same features as the ones specified in the "US" column.

I have ordered a microphone for my 3750. Once soldered, ASR should work for me as well. I'll report the part number and the procedure once I'm done.
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sussamb · Posted: Mon Jan 02, 2012 11:52 pm Post subject:

Can anyone tell me how to get updater.exe?

And also confirm how to put a nuvi 1490 into service/pre-boot mode? I've seen various suggestions Confused

alix776 · Posted: Tue Jan 03, 2012 12:18 am Post subject:

Just a note of caution please make a full backup if your device before trying any of the above as then if something does go wrong you can atleast then reinstall the backup
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currently using aponia truck navigation on windows phone. Good bye IOS don't let the door hit you on the way out .

Oh the joys of being a courier.
device Lumia 950 xl

turboccc · Regular Visitor Joined: Jul 01, 2008 Posts: 63

Updater.exe can be found with a google "garmin updater.exe". I found this link:

http://www8.garmin.com/support/download_details.jsp?id=242

Download this file. You can run it or right click (unzip/unrar it) in a folder. You'll find the file updater.exe there. Dismiss the other file.

As for pre-boot mode, it differs sometime from one model to the other. Try this one:

1- No USB connected, click 10 seconds on the battery to enter the service mode.

2- drag your .rgn over updater.exe and select USB

3- Connect the USB

4- Once connected, click Update in updater.exe

About a backup: Not sure about that unless you plan to dump all regions. Just upgrading the logo, firmware or some other things will affect only the firmware and not the files saved in the different folders that you could backup with a USB cable. The most important thing before flashing is to ALWAYS use the original unmodified boot.bin you got on your GPS.
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Latest RGN_Tool, GIR_Editor, Extra_POI_Editor and other Garmin tools: Click HERE

sussamb · Posted: Tue Jan 03, 2012 8:53 am Post subject:

Thanks Turbo, I found that file too but wasn't sure if it was current.

My problem is that my nuvi is stuck on Map Loading ... corrupted map file I think. I just need to get my PC to recognise the nuvi so I can delete the corrupted file, is there an easy way to do that?

sussamb · Posted: Tue Jan 03, 2012 8:54 am Post subject:

turboccc · Regular Visitor Joined: Jul 01, 2008 Posts: 63

sussamb · Posted: Tue Jan 03, 2012 5:58 pm Post subject:

Yes, thanks, discovered that this afternoon ... all working again now Very Happy

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