Bip39 Dart. Even though it works by using BIP32 technique you'll be able to nevertheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There may be BIP44 Edition which some wallet use with the generation of seeds. Following entry, double Look at you're entering your desired passphrase. https://classifylist.com/story20530955/mnemonic-seed-phrase-generator-getting-my-word-list-bip39-to-work