FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 19)

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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.
2) Local upgrade
Also, the M11 Plus can be upgraded locally by a firmware package. Download
the firmware package file from FiiO.com, and copy it to the internal storage of
the M11 Plus or an SD card. Go to the "Technical Support->Firmware
Upgrade->Local Upgrade" menu, and find the firmware package file to start the
upgrade.
Notes:
1) Do not unzip the firmware package file.
2) Before the upgrade, ensure the power of the device is adequate (>30%) so to
avoid upgrade failure.
3) If the device goes to factory mode which cannot detect the firmware, the
reason may be that the firmware file is damaged. At this time, press the power
button to reboot the device. Re-download the firmware file and restart the
upgrade.