My remote is suddenly dead. I've changed the

I had the same problem and talked to the supplier. They gave me the following fix which worked ok. )Apparently its easy to accidently pres a button combination that screws up the mullti region settings.
1. Power box off, then on. (no dvd in tray) 2. Press the following buttons on the remote Subtitle, Repeat, (not repeat AB ) 5,6,7,3,2 3. You then should see a screen giving current region and letting you choose your region. "0" is region free so pick that. 4. Turn box off then on and it should work.

Remove the batteries. press any two buttons simultaneously for 2-3 minutes to reset the control. reinstall batteries and should work. this is in the owner's manual as well