Pull up to 45K, put your oxygen mask on, and depressurize the plane.
They will all be quiet in a few seconds.
It will work at 35K, but take a little longer.
I read that the oxygen supply to the passengers can not be disabled from the cockpit. On the other hand, I don’t think the pilots were flying this plane, or if a fire started, had much ability to make any inputs due to compromised electrical/software system.