Aint gonna work. I've tried this many many times. On some chinese units it works on others it doesn't. Many possible solutions include registry hacks but no luck so far. The only solution is to use an older version as discussed on XDA Developers but then you can't use the newer maps. Anyway, you might want to give Sygic a try. Works similar to Tomtom except for that it does actually work on these chinese units.