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

Originally Posted by ygps

Looks like the file was delete!!
Is the "updater.exe" the same as webupdate that can be downloaded from garmin website?
I just got nuvi 1490T and try to change its OS to enable Thai JCV.
Now I think I have rgn file ready, but don't understand how to flash it with rgn file in pre-boot mode.
Could you pls give more detail on this step?

updater.exe is not webupdater.
The other way to convert your unit without updater.exe is to use RGN_Tool to save your rgn file to a gupdate.gcd file ., remember to override swv to same number both boot and fw_all.
and not forget to delete a gupdate.gcd within .system in your unit.

Place gupdate.gcd in sd card\garmin\gupdate.gcd
turn off unit --> insert card--> turn on unit --> begin flashing.

But I advice you should have updater.exe because you need this tool for recover nuvi if you get in problem ie rebooting.

Originally Posted by aekhong

updater.exe is not webupdater.
The other way to convert your unit without updater.exe is to use RGN_Tool to save your rgn file to a gupdate.gcd file ., remember to override swv to same number both boot and fw_all.
and not forget to delete a gupdate.gcd within .system in your unit.

Place gupdate.gcd in sd card\garmin\gupdate.gcd
turn off unit --> insert card--> turn on unit --> begin flashing.

But I advice you should have updater.exe because you need this tool for recover nuvi if you get in problem ie rebooting.

Thank so much for the detail steps and for the updater.exe file.
I flashed my nuvi 1490T several times, but after it booted up it reported an error msg like "hardware problem gps is disable pls send unit to engineer of gps 2xx for repair".
After that my unit stuck at stage "Updating software for EcoRoute HD" for so long that I decided to flashed it back to its original firmware.
Do you know how to fix this kind of problem? Any suggestion?

Kenokin.,
When did your 3790 lost visibility of gmapdem.img., after went to CHN2.20 ??
Can you see the main detailed map?

turboccc converted his 3750 to CHN2.20 and he got 3D., DEM ability.