Bip39 passphrase github http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Regardless that it works by using BIP32 approach you'll be able to continue to import BIP39 seeds into Electrum wallet. Also aside from BIp32 There may be BIP44 version which some wallet use for that technology of seeds. BIP39 enhances wallet safety by earning backups trusted, https://bookmarksparkle.com/story20738012/bip39-github-not-known-details-about-bip39-word-list-txt-https-linktr-ee-bip39