In case you're not able to update your headphones, you can try to perform a Force Update :
1. Plug the USB cable to your computer
2. While pushing on the power button, plug the micro-USB cable to the 3D Sound One. Keep pressing the power button during 2 seconds.
The light will briefly turn steady blue then turn steady purple :
(NB : It can also turn green instead of purple if your headphones are running an older firmware)
3. Click on "Menu" and select "Headset"
4. Clic on "Rescue"
5. Wait for the two updates, then click on "Ok"
The LED is blinking Blue, your headset is now updated with the latest firmware.
You can enjoy 3D audio with the 3D Sound One !