Bip39 Passphrase. Press X to abort passphrase application and hold enhancing the passphrase. Selecting Terminate just after an abort will stop the process. And you need to have created it down for those who ended up hoping to keep a possibility open to restore your accounts. BIP-32 hierarchical deterministic wallet. https://bookmarkinginfo.com/story18953516/bip-39-https-linktr-ee-bip39-bip39-words-secrets