then it was changed at set up time … who set it up ?
you can try blanking out the user name and type [admin] (lower case, no brackets ) as the password…
OR (and you’ll have to reset/configure it completely afterwards)::
find the little hole (should be in front of the four port model) and press the reset button with a paperclip hold it in for about a minute, this CLEARS EVERYTHING back to factory settings including logs, passwords, etc.