Sorry sir. I just arrived at home.
I would like to summarize my investigation for your reference.
After completing yesterday setting, I can connect the headset in my PC with following ways.
1. Yesterday, your good team was downgraded my headset firmware to some version.
2. After that, If I connected USB first and then more than 5 seconds, i need to connect my headset to HDMI port.
3. And then Piplay program can recognize my headset and i can enjoy.
But today i tried to upgrade firmware as per Piplay program notice, but i cannot use again same as before.
I think the firmware have some incompatibility like my pc.
Based on above situation, I would like to request your support, if you available. thank you!