If you mean you no longer know your Login and password to change settings there is no way to "Bypass" them, Only way to "Reset" them is to reset the whole router.
If you do have the username and password you can go and "backup" the settings.
All the ethernet ports light up and flicker when I plug in the power but the power and WLAN lights...
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All the ethernet ports light up and flicker when I plug in the power but the power and WLAN lights do not come on. This seems intermittant but it has been off for a long period of time this time.