T4S/T8S Check your Firmware
Turn the Rotary Selector to Prefs.
Turn the left-most button (Menu) to Versions.
Press the left-most button to select Versions to see the current firmware version
The latest version of the T4S/T8S firmware is version 1.1.5 (June, 2022)
If you need to update your firmware see:
T4S T8S Firmware Update Instructions