WH62 headset stuck on mute

[anonymous1712222627012]

I have got at least 4 of yealink Wh62 headsets with the same fault in the past couple of months. The fault is the mic is stuck on mute when used with a deskphone, and doesn't work at all with the computer. I wonder if there is a quick fix for this, or at this point are the headsets bust? I have tried updating the firmware and resetting the headset, is there anything else I can try?.