Bip39 generator offline https://www.hometalk.com/member/176312665/elva1377050 Though it uses BIP32 strategy you are able to however import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 Variation which some wallet use for that era of seeds. Press X to abort passphrase software and continue to keep modifying the passphrase. https://eternalbookmarks.com/story19980636/bip39-number-of-words-bip39-converter-an-overview-https-linktr-ee-bip39