3790 device.xlm after updating to 4.10 has an error ,so everytime you run webupdater it shows this update to download and install.
If you dont safely remove your gps you will get "Scan and Fix" from Windows
To update use Webupdater or my dashboard from myGarmin page
To downgrade look here
[Only registered and activated users can see links. ]
about Philippines locale I'm afraid you should have an asian sw to have it.