D-Link DWR-2101 - Restore the Device

Section 7 – Settings
D-Link DWR-2101 User Manual
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Restore the Device
Press the power button to wake up your screen.
Slide your finger across the indicator to unlock your screen. If you've set a password to unlock your device, you'll need to enter it to proceed.
Swipe your display to navigate to Settings on your homescreen.
Tap Settings.
Tap Restore Default.
Tap Restore to restore all device settings to the original factory settings.