Android application for controlling the Fiio K9 Pro via Bluetooth low energy and Qualcomm GAIA (Generic Application Interface Architecture). This application is in maintainance-only mode.
You can verify the signing certificate on the APK matches this SHA256 fingerprint:
5D:93:4D:38:7D:58:A4:B5:C2:F5:06:9D:0A:25:DD:9E:B7:3B:FC:B0:A5:63:A1:61:0E:E6:A0:90:1C:23:9A:B4