Bip39 passphrase github https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide Regardless that it uses BIP32 technique you are able to continue to import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There may be BIP44 Variation which some wallet use for that technology of seeds. BIP39 solves this through the use of human-readable seed https://total-bookmark.com/story20036875/iancoleman-bip39-github-bip39-compatible-wallet-options-https-linktr-ee-bip39