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Hi, it is rare that Trezor gets bricked during the update, but it may happen. The only way how to make sure that you will never lose access to your funds is by having the wallet backed up, meaning that you need to have a correct recovery seed written down and stored on a safe place (and passphrase, if you use any).
If you have your seed, you can always recover your wallet with it, even if your device is wiped or even bricked and you have to use a different Trezor (or other compatible wallet) for getting to your funds.
There is no solid advice on how to prevent getting the device bricked, but with a backup of your wallet you can be sure that you can get to your funds anytime.