To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here.
Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/ Unlock procedure to many popular brand TVs are given.
Service mode entry, adjust and exit procedure to many popular brand TVs are also given. Never forget to exit the service mode, after all adjustments have been done.
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