To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it after 30 minutes or so. This must make it a hard reset. If you want to make it a system reset [factory reset]; you have to enter its service mode menu. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. 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.
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