This is not an OTA (Over-the-Air) update like a Samsung or iPhone. You will use the "Rockchip Batch Tool" or a simple "Flash via USB/SD" method.
Subject: Firmware Update Request – YT9216BJ-00012-V001 Yt9216bj-00012-v001 Update
Manual Update (Firmware/Stock ROM):If no online update is available, you may need to manually flash a "Stock ROM" using a USB drive. Feature Suggestions Based on Common Update Practices
Audio Enhancements: Newer versions often include improved equalizer interfaces and better sound processing, sometimes referred to as "Hi-Fi" modes. Part 2: Preparing for the Update – What