Change encrypted password on mysql

I am trying to enter the admin panel of a web which I don't know the password of, the web has an older backup where I can enter the admin panel, from the old db I copied the field of the old encrypted password that works on the new db, but it does not work, I don't know that much about webs, so I don't really know if the password field is linked to something that decrypts the password, thanks for you help.

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