Cardano firmware issue - Do I need the Cardano wallet seed phrase or just the BIP39 trezor generated?

I have the BIP39 seed from my trezor. I thought I had a SEPERATE seed phrase for backing up my Cardano secured by the Trezor as well.

Firmware upgarde required for Trezor Suite support of Cardano. Great! So I check my backup, and it’s not the correct wallet. I don’t want to upgrade without (Cardano seed) backup, but it requries I upgarde in order to send out assets now…

Please help? Do I just need the BIP39 seed to reestablish cardano private key with Trezor? Or do I need the cardano wallet seed phrase?