1. Optimize the compatibility of Bluetooth.
2. Add the Bluetooth output to support DSD64 file.
1. Be sure AP60 II has a 50% above electric quantity.
2. Copy the "update.upt" file to TF card.
3."System setting" - "System Update" - "OK"
Wait and finish the upgrade.
Hghly appreciate your kind support. And we look forward to hearing your feedback.