vs2 figured it out HERE. I confirm it works fine. I switiched my T-mobile USA firmware to the Videotron Canadian one as I wanted French and not Spanish as my 2nd language. From vs2: Try it without the master clear at the end. I am unlocked and rooted. When I did the master clear it wiped my unlocked status away; I had to re-enter my unlock code. When I tried it without the Master Clear, all of my installed apps STAYED! You can download the various .update files from the Garmin site: Garmin-Asus - Connect. Communicate. Navigate. Just click on the world map in the top right corner and select one. This is not a custom ROM, but at least it's a change from the usual.