I think i found a solution:
- Disconnect wireless dongle
- Connect Virtuoso SE to PC via USB
The headset is blinking red now?
- Plug the microphone into the headset
- Press and hold the microphone mute button
After a few seconds the blinking should stop.
- Hold the button for 2 minutes or so. (i think the blinking was asking too much power so it couldnt start, some kind of bootloop)
- Release the mute button.
My Virtuoso was turning on and charging after this.