Bip39 Passphrase. You'll then do a standard recovery with a command such as the just one under. (This command makes use of a sample wallet file bunlded with BTCRecover) BIP44 defines a certain important derivation route structure which allows for controlling many accounts and coin styles within a single wallet, https://thebookmarkplaza.com/story19501287/bip-39-https-linktr-ee-bip39-not-known-facts-about-bip39