I can hear sound when I hard-wire the headphones into a source using the jack. The headphone power button will not turn on or light up. The volume buttons don’t work. The noise cancellation button does not work. I can increase and decrease the sound level by using the volume control on the device that I’m plugged in to. Even when I can hear sound (music) while plugged in, the headphone sound turns off and on randomly, but the controls, including the power button on the headphone never turn on – not even randomly. I deleted the headphones from the WYZE app. I cannot add them back to the app because they will not turn on so that the app can find them. Even with continual attempts (in the hope that somehow the random off and on sound makes a difference), the headphones will not turn on. The headphones worked great and I loved them until I attempted the firmware update. They have not worked since. Plugging into the computer can give me on and off sound, but that is all.