Thread: How to convert 3790us to 3790 Sg/My

Originally Posted by aekhong

here is the step from turboccc
•File->Open and select your US firmware GCD or RGN file
•Click the Save button in the boot.bin section (the first on top) and save it to boot_us.bin
•File->Open and select your Sg/Mal firmware GCD or RGN file
•Click the Load button in the boot.bin section (the first on top) and load boot_us.bin (the one you saved in previous step)
•Notice the HWID and SW Version from this boot.bin and copy those numbers in the Overrides section. Enable the checkboxes and put the numbers from boot.bin.
•File->Save to RGN (or to GCD) and select the RGN (or GCD) file name.
•Flash RGN in pre-boot/service mode using updater.exe from Garmin, or copy GUPDATE.GCD to your GPS and reboot.

hi,
i can't find the gupdate.gcd firmware on the hidden 'System' files for my US nuvi 3790T. i have opened every folders and nothing is found at all. the only .gcd file i was able to locate in the whole hidden "System" folder is in the folder named 'RemoteSW' which has five files namely as 006B090100.GCD, 006B107300.GCD, 006B121100.GCD, 006B121102.GCD and 006B125700.gcd. how can i go about to locate exactly the gupdate.gcd file of my unit?
i just got this unit today from the US and first thing i did is backup the whole internal storage files for keepsake. Details of the unit's

About
Model: nuvi 3790
Unit ID: 38xxxxxxxx
Software Version: Software Version 4.90
Audio Version: 3.00
Text Version: 4.90
GPS Firmware: 2.60
Bluetooth Firmware: 3.0.35 P55
PMIC Version: 824
TSC Version: 1.23

My friend has a Nuvi 1490T and just as you open up the hidden "System" files, there you would see right away the gupdate.gcd file just on the root of the hidden directory. how is it so that i don't have that in my unit? i hate to think that the very first requirement (which is to locate and copy the gupdate.gcd file) to upgrade or change firmware for this unit is afront a failure already. i hope somebody can help me. i have not gone online to get the unit updated thru the website of garmin yet until i have heard anything from the experts if it is a safe go now to do so.
thank you and have a nice day.

@jackmawatin
If you can't find the gupdate.gcd it doesn't mean that you have to update the fw, but if you do update to 5.00 online from Garmin, a gupdate.gcd file should be then present. You can also obtain 4.90 and 5.00 versions here: [Only registered and activated users can see links. ].

NP. Just beware that sometimes flashing US/EU fw devices to Asian fw can give more problems than it brings benefits. If you use your original US boot bin you will be able to flash back to original US fw ok though. Good luck and let us know your results.

PS: Only Coppers and Lawyers call me 'Sir', both professions make me nervous and anyway i think they spell it 'Cur'

thanks neil for being there. updating firmware is the last thing i can think of and that i will do now. i will keep you posted if ever that mysterious file shows up after the update. yes, i will keep in mind to just stay with my original US boot bin. thanks for noting that as well.

FYI
that mysterious file showed up already as soon as i got the version 5.00 update. it wasn't really there in the first place. thanks for the guides and now going to the second stage of this work around.

-Whenever you will flash Nuvi with a new rgn file, you need to delete .gcd file within .system first or your Nuvi will reflash with .gcd file back to currently firmware.
-use original US boot.bin as Neil said.
-Back up your Nuvi(Memory) before flashing.