You're asking about how to do a Factory Reset to this set, I assume, and posts this solution. To do a factory reset, you have to enter its service mode option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/
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