Bip39 wiki https://sergiouwfc622.fotosdefrases.com/exactly-how-to-generate-a-bip39-seed-a-step-by-step-guide Although it makes use of BIP32 process you can continue to import BIP39 seeds into Electrum wallet. Also aside from BIp32 there is BIP44 Model which some wallet use for that era of seeds. It is straightforward — if you do not concern yourself with copyright inheritance, https://bookmarkspiral.com/story20500524/bip39-first-4-letters-about-bip39-2048-words-https-x-com-tundra838554