sup , got a hack for the HT-DM150 but it also works for HTEV100 ,so here goes
-switch off player & unplug from mains
-wait thirty seconds
-reconnect power supply
-turn player ON using remote
-hit ENTER on remote
- press 8,4,2,6 AND 9 on remote
- hit ENTER on remote
- player will switch off
- turn player ON using remote
player is now region free.
this does work i`ve used it on my own HTEV100