ZyXEL Communications XGS4600 Series - Change the Default Administrator Password

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www.zyxel.com
1.9.1 Change the default administrator password
1 Enter the web GUI and go to Menu > Management > Access
Control > Logins > Click Here. Enter the Old Password and New
Password. Then click “Apply”.
2 After clicking the “Apply”, the browser will show a message
similar below.