Use ADB or a package disabler to freeze:
If you own a Chinese all-in-one car stereo, chances are you’ve stared at the "System Update" button and wondered, “Should I press this?” yt9216cj android update
The YT9216CJ is one of the most popular budget Android head units on the market (often sold under brand names like "Junsun" or "Winca"). It runs on the ancient Android 8.1 (or a faked version of 10), but sometimes manufacturers release updates to fix bugs, improve Bluetooth connectivity, or update the CAN bus integration. Use ADB or a package disabler to freeze:
Warning: Updating this unit is not like updating a Samsung phone. One wrong file can turn your head unit into a paperweight. Here is everything you need to know to do it safely. If you own a Chinese all-in-one car stereo,
Some YT9216CJ units hide the updater: