Before attempting any update or flash, you must know which version of the software your device is currently running. This helps you determine if an update is available or if you need a specific firmware file for your region.
The safest and most common method. The device automatically checks for updates, but you can manually trigger it: System Update About Phone System Update Check for Updates If available, download and select Restart Now to install. TCL Mobile Upgrade Tool: Firmware TCL 30E