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 audio protection
1.Press up button ▲ or down button ▼ to select all audio 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 audio or cancel undo protection (only undo protected files). Procedures as below:
:Start / Stop
Exit audio playback menu:
40
