Green lights are blinking, when I connect the cables to the ports. When the router is plugged only into the power, only power light is shinning(solid red). Interestingly it first glows green, but after second or two, turns to red.
The reason why I tried to update the firmware, was because I got that router from ISP(which uses custom firmware), but I don't use their services anymore . For some reason, they didn't want their router back. But their custom firmware restricts using other networks, so I wanted to restore the firmware, to the original, factory one. By pushing the button at the back of router, didn't change anything, that's why updating was the only choice.