Page 1 of Mustek HT-720 Multi-Region Hack

1. switch on unit without disc
2. press SETUP
3. press NEXT >>
4. press PREV <<
5. press NEXT >>
6. press PREV <<

The current region code will appear in the upper right corner of the screen (e.g. VER2)

7. press cursor buttons LEFT < or RIGHT > to change region code from VER1 through to VER6 and VER255 for region code 0

8. press SETUP

Tried and tested.