Antwort auf: Möglicher Trezor-Hack?
Hi!
1.
No, because Trezor device would display a warning sign upon being powered on, if there was any unofficial firmware installed.
2.
No, Trezor always stays offline, meaning you can even use it on an infected computer.
3.
My guess is a phishing attack. You mentioned that the user lost the coins after doing a firmware update. It is possible that the prompt for a firmware update were given by a phishing site that also prompted the user to enter their seed online after displaying some fake error message. That is, unfortunately, by far the most frequent reason for losing coins.