10. How to update the Bluetooth firmware of BTR15?

Online upgrade：

1. Set the button on the side of BTR15 to the BT position and connect to Bluetooth in the phone settings. Download the Fiio Control App on your phone and connect the BTR15. On the BTR15 page, click the settings pattern in the upper right corner, find "Firmware Upgrade", find "Online Upgrade" and click it. If BTR15 has available Bluetooth firmware, a pop-up window will prompt you for the new version. Click OK to upgrade.

Please note: During the firmware upgrade process, please do not leave the upgrade interface, otherwise the upgrade may fail! The upgrade may take a long time, please be patient. If the upgrade fails, you can try again.

Local upgrade:

1. Import the "BTR15_Vxxx.bin" firmware into the mobile phone;

2. Set the button on the side of BTR15 to the BT position and connect to Bluetooth in the phone settings. Download the Fiio Control App on your phone and connect the BTR15. On the BTR15 page, click the settings pattern in the upper right corner, find "Firmware Upgrade", find "Local Upgrade", select the firmware imported to the phone, and start upgrading the firmware.

Please note: During the firmware upgrade process, please do not leave the upgrade interface, otherwise the upgrade may fail! The upgrade may take a long time, please be patient. If the upgrade fails, you can try again.