Found an old wallet with btc but can't log in

So, I was doing some digging today and found an encrypted file in my dropbox. It has a wallet ID from blockchain.info and a password. Years ago, I lost access to a wallet where I know I had some btc. The file also has a 20-word mnemonic... I tried to recover it on blockchain.com (it used to be blockchain.info) but none of the words worked, and the mnemonic seems too long. The password I have worked, but then it asked for a second password that I just can't recall. I've given all the passwords I could think of from around 2012-2013. Any suggestions on what I could do? Also, what kind of wallet uses a 20-word mnemonic? Sorry if this isn't the right section to post this. I'd really appreciate any help!

Without the second password, you will not be able to decrypt your wallet. You'll need your "wallet.aes.json" file to bruteforce it using BTCRecover; but AFAIK, the tools that can extract that from their server now can't since it's designed for the old version. (like "download-blockchain-wallet.py" from old BTCRecover) Try their support. (Good Luck) Since it came from the same backup, that must be your old Recovery Phrase that is not BIP39 compatible. The page where you restored it may be for their 12-word BIP39-compatible Recovery phrase: https://login.blockchain.com/beta/auth/recovery?import Where it should be restore to their legacy recovery phrase page: https://login.blockchain.com/beta/legacy-pages/forgot-password.html (which isn't working last time I tried) However, even if the mnemonic works, it will just show you your password and wallet ID that you already has.