Bip39 Passphrase. Push X to abort passphrase application and continue to keep modifying the passphrase. Deciding on Terminate soon after an abort will prevent the process. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. Each word represents a amount within a binary sequence, https://ledbookmark.com/story4274320/bip39-passphrase-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-wallets