I live in an apartment building and no one lives above me. Randomly last night there started to be a loud "buzz" coming from my ceiling vent. What is strange is that the buzz is still there when the power is cut and no heat or AC is running so I'm not sure what to do. I was considering bothering my landlord about it do you think that is appropriate?

Question is in title. I bought a new Trezor 5 off Amazon, installed firmware, then used the device to recover an old wallet. After moving the funds out I did a factory reset and received a warning firmware was already installed despite the factory reset.

This device is still fine to use, correct?