Bip39 dart https://penzu.com/p/2ea6922b70254307 Though it works by using BIP32 system you could continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Model which some wallet use for that era of seeds. BitBox02 - A successor on the BitBox series, this components wallet supports BIP39 seed https://rotatesites.com/story21490181/bip39-generator-github-bip39-generator-secrets-https-cutt-ly-uryc5rw7