are there any dangerous to upgrading firmware when it comes to devices used in multisig? Or you mean because you have multiple devices you will spend more time keeping them all up to date in regards to firmware running on them?

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The latter. There is a maintenance burden when compared to #BIP39 in that the firmware for multiple devices has to be considered.

thank you for the reply. I'm still trying to decide whether a passphrase of multisig with something like unchained would be best in my scenario. Not just security wise, but also how practical is this solution.

Or something like seedxor, I'm still trying to decide.

Multisig without multivendor is not advised.