replace settings app After an update I cannot use my settings app it gives an error unfortunately settings app stoped working so reset my phone and now I cant do anything any help on allowing apps from unknown sources without settings app or enable usb debugging without setting any thing will help
There's no other way to change the "unknown sources" setting, but if you root the phone you can find apps to toggle USB debugging simply by searching on Google Play.

There's no way to replace the settings app without replacing the whole ROM. The settings app is just too closely tied to the rest of the system: it's not designed to be replaced.