to either protect single track or cancel protection, a lock icon 
will now appear on the upper right corner of the screen (apply protection to protected files to unprotect it).
Delete all tracks
1.Press up button ▲ or down button ▼ to select all to delete, then press the confirm button 
.
2.Press up button ▲ or down button ▼ to confirm or cancel, press the confirm button 
to either delete all files or cancel deletion (protected files cannot be deleted).
Undo all track protection
1.Press up button ▲ or down button ▼ to select all tracks to protect, then press the confirm button 
.
2.Press up button ▲ or down button ▼ to confirm or cancel, press the confirm button 
to either unprotect all tracks or cancel undo protection (only undo protected files).
Return to MP3 player interface
To return to MP3 player interface, press the MENU button.
Exit MP3 player
To quit the MP3 player, press the MP3 button when no tracks are being played.
Radio
Press the MUSIC button (press the MUSIC button again to return to previous mode) and then press the up button ▲ or down button ▼ to the left of the LCD screen to select FM
option and press the confirm button 
to enter the radio mode, procedures are as below:
Auto tuning (before auto tuning the headphones must be plugged into the audio plug)
After entering the radio mode, press the confirm button 
(hold for 4 seconds) to automatically tune to local stations until auto tuning is complete.
As illustrated:
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