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With K15 powered off, hold the volume knob, then turn on the AC power switch.
K15 will boot into a black "Updating" screen—release the knob. Wait ~10 minutes
for completion.
If issues persist, please contact FiiO support.
2.USB Drive Upgrade:
Tutorial video(Same as K17):
https://youtu.be/anhViDWo4Ws
Download the latest firmware and guide from Fiio ’ s website, then follow the
instructions to copy files to the USB drive. Navigate to Menu > Other Settings >
Firmware Upgrade > Main Controller Local Upgrade.
Note: Some USB drives may have compatibility issues. Try another drive or contact
support if the upgrade fails.
MCU Upgrade:
Tutorial video(Same as K17): https://youtu.be/WN-fyWZ53fQ
Notes:
Windows: After copying firmware, right-click the USB drive in "This PC" and select
"Eject". Using the system tray’s "Safely Remove" option will cause MCU upgrade
failure.
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