Bip39 Checksum. Push X to abort passphrase application and preserve enhancing the passphrase. Choosing Terminate after an abort will cease the method. BIP39 is actually a style and design implementation that lays out how copyright wallets make the set of words (or "mnemonic codes") that make up a mnemonic sentence, https://siambookmark.com/story19018186/bip39-word-list-pdf-https-linktr-ee-bip39-not-known-details-about-bip39-wallets