Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Invalid Hex String:Null Error When Using Recovery Key

  • 2 replies
  • 0 have this problem
  • 55 views
  • Last reply by James

Hi, I'm trying to recover my FF account using the recovery key. I used Google Authenticator for 2FA, reset the phone, found out GA doesn't back 2FA accounts up remotely. That was a few years ago; I gave up and went back to Chrome. Trying again to regain access to my FF account now, if possible. I don't have the backup codes, but I do have the 32 character recovery code, but I'm getting this error (screenshot) trying to use it. I tried the key with spaces (8 4-character blocks) and without, got the error both times. What am I doing wrong here?

Hi, I'm trying to recover my FF account using the recovery key. I used Google Authenticator for 2FA, reset the phone, found out GA doesn't back 2FA accounts up remotely. That was a few years ago; I gave up and went back to Chrome. Trying again to regain access to my FF account now, if possible. I don't have the backup codes, but I do have the 32 character recovery code, but I'm getting this error (screenshot) trying to use it. I tried the key with spaces (8 4-character blocks) and without, got the error both times. What am I doing wrong here?
Attached screenshots

All Replies (2)

If your 2A fails and email reset code don't work that account is a lost account at this point. There's nothing forum users here can help to recover account or codes.

https://support.mozilla.org/en-US/kb/reset-your-firefox-account-password-recovery-keys

Note if you reset password it will delete what you have synced.