Bip39 add private key https://www.anobii.com/en/01000289012ff9b293/profile/activity Although it works by using BIP32 approach it is possible to still import BIP39 seeds into Electrum wallet. Also other than BIp32 There is certainly BIP44 Model which some wallet use with the generation of seeds. BitBox02 - A successor to your BitBox sequence, this https://bookmarkingace.com/story20071003/iancoleman-bip39-github-5-simple-statements-about-bip39-converter-explained-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw