Updating a is challenging because Coby Electronics Corporation went bankrupt in 2013
You will find shady websites offering a Coby TV firmware update for a fee. Be aware: coby tv firmware update
Plug the TV back in and turn it on. Most models will automatically detect the file and show a "Software Upgrading" progress bar. Do not turn off the power Unplug TV
While traditional OTA (Over-the-Air) updates are typically unavailable for these older models, you may be able to update or repair the system software using these methods: USB Drive Update The Risks of Downloading “Coby TV Firmware” from