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Insert a USB drive (formatted as FAT32) containing the unzipped SOC firmware
(a .zip file downloaded from FiiO’s website) into the K15’s rear USB-A port.
Navigate to Settings > Firmware Upgrade > SOC Upgrade to initiate the update.
Key Notes:
1.Do not rename or extract the .zip file.
2.Place the file directly in the USB root directory (no subfolders).
3.macOS users must disable Safari’s auto-unzip feature: Safari > Preferences >
General > Uncheck "Open safe files after downloading".
(3)MCU Upgrade:
Download the MCU firmware (a .bin file) to a computer.Connect the K15’s RS232
port to the computer via USB. Navigate to Settings > Other Settings > Firmware
Upgrade > MCU Upgrade. A virtual USB drive will appear on the computer.
Copy the .bin file into this drive, then eject the drive via "My Computer" (not the
system tray icon). The K15 will auto-reboot after upgrading.
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