How to update a Trezor device without the Trezor backend?
The Trezor backend at wallet.trezor.io is suboptimal from a privacy perspective. Many people choose to use Electrum, Wasabi or any other wallet that offers more privacy.
The Trezor Android app may be able to upgrade a Trezor wallet this but it didn't do anything for me plus it's unclear whether it sends your XPUB to Trezor's servers anyway. So is it possible to update a Trezor hardware wallet without going to wallet.trezor.io or the Trezor Android app, and if so, how?