Forget password

[Khiemis]

Netgear c6900 username admin, password : no working

[plemans]

did you factory reset? 

Those are the default login info so you'd have to be back at factory settings for them to work

[michaelkenward]

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@Khiemis wrote:
no working

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"No working" isn't much to go on.

If the suggestion from @plemans doesn't work, tell us a bit more about what that means.