The best solution for you in this case is to reset the decoder to factory default.
- Using the remote control => Press the "MENU Key"
- Scroll down to settings and press OK to select
- Scroll down to General and press OK to select
- Choose Factory Reset and press OK to select
- Press OK again to verify
- The device will restart. just wait (about 30-40 seconds) until it comes back on.
- Choose your TV screen size and press OK
- Press OK to start an automatic search.
- When automatic search is done' press OK to continue
Please note that all channels and system setting value will be cleared.