Bip39 Bitcoin Testnet Wallet. While it uses BIP32 strategy you may continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Model which some wallet use for that era of seeds. The entire process of putting together a copyright wallet is similar to other software package https://finance-auto-now94827.wikimidpoint.com/4569286/the_anatomy_of_the_bip39_phrase_entropy_terms_and_security