Bip39 dart https://www.demilked.com/author/gobnettlmz/ Though it works by using BIP32 system it is possible to nonetheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There exists BIP44 version which some wallet use for your generation of seeds. Push X to abort passphrase application and hold enhancing the passphrase. https://thesocialdelight.com/story6250330/bip39-bits-new-step-by-step-map-for-bip39-github-https-cutt-ly-uryc5rw7