RIP TUNES MP1872 Instruction Manual page 18

B) Lum / Brightness: In this menu, there are five options: 1, 2, 3, 4 and 5.
C) Backlight Mode: In this menu, there are two options: Normal and Power
Save.
System
In this menu, there are three options: About, Upgrade and Default Set.
A) About: The following information is displayed: storage capability, remaining
capability, system software version.
B) Upgrade: A pop up dialog box will appear when you press the M button,
press  or  to select Yes or No and then press the M button, connect the
player to the PC via the USB, and the system will enter the firmware upgrading
status.
C) Default Set: Use if you want to reset the player to the default settings. A
pop up dialog box will appear when you press the M button, use the  or 
buttons to select Yes or No and press the M button to confirm.