The NGRAVE ZERO is compatible with mnemonic phrases. However, we recommend that for optimal security you create new keys on your ZERO wallet and transfer your funds to the offline-generated keys.
To import a mnemonic seed phrase, select Import wallet during first time use and choose for Mnemonic wallet. Importing a 12, 18, or 24 word seed phrase is easy with the touch screen and built-in keyboard that will prefill the words while you're typing them.