Is there any risk in updating the bootloader of Trezor Model T?

Security
1

Is there any risk in updating the bootloader of Trezor Model T? What should be done if a non-official bootloader signing program is installed during the update process? Does Trezor Model T have any relevant defense mechanisms?

2

No

First of all, this will not happen unless you deliberately install an unofficial firmware and click through a red warning screen.

Second, the result will be a soft-bricked device that does not start.
In this case, what should be done is you should contact Trezor support for instructions on how to create a recovery SD card with a known good bootloader. You will insert this SD card before plugging the Trezor in, and then wait until the bootloader is installed.

Afterwards, you can continue the way you would on a factory-clean Trezor: install firmware, set up or recover a wallet, etc.

Yes.

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