Bip39 checksum calculator https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Though it works by using BIP32 system you'll be able to nevertheless import BIP39 seeds into Electrum wallet. Also aside from BIp32 There exists BIP44 version which some wallet use for the generation of seeds. BitBox02 - A successor to your BitBox sequence, this hardware wallet https://socialbaskets.com/story5625601/bip39-list-a-simple-key-for-bip39-github-unveiled-https-linktr-ee-bip39