How to restore to factory firmware The procedure used for the DIR-615 D3 has been tested successfully on the DIR-615 E3 as well. 1) Set your computer's ip manually to: 192.168.0.X (not 1) AND set your subnet mask to 255.255.255.0. 2) Unplug the power cable to the router 3) Press the reset button and plug in the power cable when the power led flashes orange release the reset. go to 192.168.0.1 4) Upload your original firmware and wait