The K9Pro/K9Pro ESS upgrade is completed on our APP FiiO Control (or FiiO Music), and it supports online upgrade and Local upgrade.

Online upgrade:
1. Switch the input mode to BT, connect K9Pro/K9Pro ESS to the phone via Bluetooth
2. Start the APP and go to the K9Pro/K9Pro ESS Status page- -> Settings-Firmware upgrade

3. On the firmware upgrade page, tap Online upgrade
4. The system will automatically detect the new firmware version (before hand make sure there is network working).
5. When the upgrade is going, please do not make any operation and wait with patience.
6. When the upgrade completes, a prompt of Upgrade completed successfully will pop up.

Local upgrade:

K9 Pro(AKM)Bluetooth Firmware downlaod link: Click here

K9 Pro ESS Bluetooth Firmware download link: Click here

1. Switch the input mode to BT, connect K9Pro/K9Pro ESS to the phone via Bluetooth

2. Start the APP and go to the K9Pro/K9Pro ESS Status page- -> Settings-Firmware upgrade

3. On the firmware upgrade page, tap Local upgrade

4. On the file list, tap the search icon and select the firmware file. 
5. When the upgrade is going, please do not make any operation and wait with patience.
6. When the upgrade completes, a prompt of Upgrade completed successfully will pop up.

Note:
1. Please confirm that latest version FiiO Control APP is installed on the phone, if not, you can download and install: Click here

2. Please update the firmware in Bluetooth mode and do not leave the Bluetooth mode until finishing update.

3. If the firmware update fails, please restart the K9Pro AKM/K9Pro ESS and update again. 

4. Both Android and Apple devices support upgrade

What to try if I fail to connect the FiiO Control with the K9Pro? 

1. Restart the K9Pro;

2. Enable the location permission  for the FiiO Control app from settings-APP menu in the mobile phone;

3. Install the FiiO Control app again;

4. If your mobile phone is using the Android 13, please contact support@fiio.com for help if the update fails. 

Best regards