You can reset the television by - while it's turned on - holding down the EXIT button on the MENU until the RESET? dialogue box pops up.

Unfortunately, I'm not fully up to speed on what digital switches occur outside of the U.S., so if someone from your region is able to explain some of the changes, I'm not able to determine what steps to take next. I would recommend calling the Samsung customer service center in your region for further assistance. I'd like to help, but they'd have more information for your local region.