The serial number must be uppercase for that tool. Use the fionaXXX (3 hex digits) or mario passwords.
Did you ever flash different firmware (i.e. Debrick it)? If so, you need to use the password in the firmware image (probably mario). The framework password has always been mario, but you cannot do much that is useful from framework (other than cat the shadow file to crack it with John and the fiona password list).
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