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It will be fine, so long as it’s naked BTC, and not wrapped (ETH)
> just want to make sure I don’t need to back anything up before updating to Bitcoin only firmware. Appreciate any insight. Thanks!
Before ANY firmware update you should always backup:
1. Seed-mnemonic
2. Passphrase (even note `none` if none is used)
3. PIN (convenience)
4. XPUB of every account that holds non-zero balance
5. Derivation of every XPUB recorded
I usually have all these before I even load an account, but you definitely need to record it before you flash. Technically, everything but the first two can be guessed, but there are plenty who have grey hairs now over the stress of not knowing the right guesses. Best to do it now.