Ensure your tablet is connected to Wi-Fi and has at least 50% battery (or connect to a power source);
Go to Settings > System > System update;
Tap “Check for updates”, your tablet will scan for the latest TCL UI version — tap Download and install (or Install now if already downloaded);
The tablet will restart and complete the update (do not turn off the tablet during the process).
Automatic updates:
Go to Settings > System > System update;
Tap the vertical ellipsis icon (three dots) in the top-right corner, and choose Update settings;
Toggle the Automatically update on — your tablet will update automatically when connected to Wi-Fi network.
