Electrum Bip39 Passphrase Default variety of iterations Utilized in wallets is 2048. Increasing this amount really should make it more secure against brute force attacks, nonetheless you will have to retail store this worth. To access your wallet with custom PBKDF2 you should use this script (or very similar) to https://web.archive.org/web/20241123074420/https://bip39-phrase.com/