Welcome to Android Central! I would be EXTREMELY careful about where you get these updates. As hallux mentioned, budget devices like RCA generally never release official updates for their devices. If you find an update file somewhere on the web, you have to make sure it's an official update from RCA, and that it's for your exact model number. If it's for a different model number, you could brick the device. If it's not an official update file, then you could be installing some nice juicy malware instead.