How Are Seed Phrases Generated Though it takes advantage of BIP32 system you'll be able to even now import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There exists BIP44 Edition which some wallet use for that generation of seeds. You may see the complete supply code in https://thebookmarknight.com/story18990318/bip39-recover-everything-about-bip39-phrase