|Download the latest firmware for your DLink router and save it to your harddisk.|
Then do a hard reset on the router, means press the reset button for 30 seconds.
Next flash the D-Link firmware by using the routers GUI.
Make sure to not interrupt the flashing process.
When you get the message, that flashing has completed, let the router alone for another 10 minutes, then do another hard reset.
This should work for you.
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Let us know, if the problem is solved !!!