To do a factory reset, you have to enter its Service Mode. If you wish to get some details; check the sites linked here.
https://elektrotricks.blogspot.com/
https://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
NB: Please read and understand well, the instructions to enter the service mode, before you begin. Be very careful. Note how to "EXIT" the service mode; after entering and adjusting data. This is very important
Search the site by type in the Brand Name of your set, in its search bar at the right side column, and press enter. See it in by Webview with mobile or by desktop. Mobile View has no search box.
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