After my beloved TT920 was stolen, I bought a refurbished TT630 for US$80 from Tiger Direct, then shipped to Australia using Ship USA. It arrived in January 2011 with 840 maps!!
When received, I backed up up the device using Windows Explorer (not TT Home), wiped it apart from ttgo.*, then installed 9.026 and Australia 860.3101 on an 8Gb SDHC card.
However the device was not stable, even after:
- Removing mapsettings.cfg from the map folder
- Clearflashtool at least 3 times
- Hard reset (which did nothing on the GO630)
Downunder35m was very helpful by pm, and he noted also the GO630 is known for problems.
If you read the forum and seach "GO630", you'll see some threads peter out, which does suggest others have had the same problem and gone back to the official Navcore.
So: If you have a GO630, stick with the official Navcore (currently 8.351 at Feb 2011), you're not missing out on much apart from the slightly nicer looking menus, as well as the 2D/3D option + 3 panes on the status bar. This will save you hours of trying different Navcores like I did.
If you're thinking about buying a GO630 - don't. Just find any other X20 or X30 with SD card slot and you'll be a lot happier.