FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 94)

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Online upgrade
If a new firmware is available and can be detected (with the M11 Plus connected
to an available internet), an upgrade notification will show up in the notification
center. Tap on it to enter the update menu for the online upgrade. If there's no
upgrade notification showing up, you can go to the "Technical
Support->Firmware Upgrade" menu, and tap the "Check for updates" icon to
check manually.
Local upgrade
For local upgrade, please follow the steps below.
1) Download the firmware from FiiO official website, such as "M11
Plus-ota-1.0.2.zip", and copy the firmware file to the root directory of the micro
SD card or internal storage. Note that the file should not be unzipped, and it is
recommended not to modify the file name.
2) Go to the menu of "Technical Support ->Firmware Upgrade-> Local Upgrade"
accordingly. Locate the firmware file (commonly known as M11 Plus-ota-1.0.3.zip)
in the "Local upgrade" page, and tap it to start the upgrade.