Dear friend,I was able to successfully install the K9 Pro AKM Bluetooth Firmware V1.31 to my K9Pro (AKM), but only after updating the FiiO Control App to the most recent version on my Android phone. I did use the online upgrade option.
Prior to updating FiiO Control, even the Local Upgrade option would fail, and Online Upgrade was unavailable.
May want to note this in your instructions for the benefit of others.
Thanks for the kind feedback. I have added this note in the firmware update instruction~
Best regards
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