You can go into the web admin to change all the passwords back to default. Go to the ip address of the unit through a web browswer and it will bring up a log in page. The default admin username/password this is admin/password. If that has been changed then you need to reset the unit. You can reset it by turning off the unit, holding down the function button for 10 seconds, while you continue to hold the function button, flip the switch to on, and then let go of the function button and then just press it once. From there you can log in and reset all of your user names and passwords to get back to your data.