FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 16)

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Android mode
Third party applications will be available at will. It can be switched to other
modes on the drop-down or settings menu.
Pure Music mode
Third party applications will be automatically disabled while FiiO Music app will
be auto-enabled. It can be switched to other modes on the drop-down or
settings menu.