Download the user manual here to figure out how,
http://tv.manualsonline.com/search.html?m=&d=&q=Sceptre+x42
There are codes that will bring up hidden menus and one menu has a reboot option that brings the TV back to factory defaults.
The two different menu codes that worked for me are:
1+ mute+1+mute
3+ mute +3 + Mute
press one key after the other
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