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Some models allow updates through the service (factory) menu. Common access codes include Menu + 8896 Menu + 1147 Source + 2580 . Within this menu, look for an option labeled S/W Update Manual USB Update

This bypasses all internal firmware issues and gives modern interface, apps, and updates.

Remember: If the update fails and your TV becomes unresponsive, do not panic. You can still use an external HDMI source – the TV will often still pass video even if the smart menu is corrupted. And if all else fails, a $40 streaming stick will out-perform any 10-year-old Coby smart interface.