How do I change the admin password for the AC1600?
To change the admin password, log in to the modem router at http://www.routerlogin.net with username admin and your current password. Then select ADVANCED > Administration > Set Password, enter your old password, enter your new password twice, and click Apply. NETGEAR recommends using a password with uppercase and lowercase letters, numbers, and symbols, up to 30 characters long.
From the official Netgear Ac1600 Modem Router manual, page 37
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