Bip39 last word checksum https://www.demilked.com/author/gobnettlmz/ Regardless that it employs BIP32 method you can nonetheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There is certainly BIP44 Model which some wallet use for that era of seeds. Subscribe to our weekly mailing list and get newest copyright news, https://list.ly/i/11078004