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8.3.3 System
 When Auto Backlight (Auto) is off, adjust the slider to adjust the screen brightness; When it is
on, adjusting the slider is invalid. The day/night mode backlight can be adjusted by touching the
icon
Day: the screen brightness under high ambient brightness
Night: the screen brightness under low ambient brightness
Menu Lock: when it is set to On, touch is invalid; when set to OFF, you can operate by touching
System upgrade: If there is an upgrade package in the inserted SD card, press this button to