Help please. This deco's LED just stays on solid yellow/green despite trying to reset it multiple times. This was going to be the main deco and something went wrong.

I have connected the deco the network via cable, tried without cable, tried plugging it directly into my laptop. I found that I could connect the Deco via the browser on the IP I had originally assigned it but all it allowed me to do was a firmware upgrade which is what I did. The deco said updated successfully but since then nothing. I can't connect to it via LAN, wirelessly or via my laptop now the LED just stays solid green.

I have tried resetting it and no luck.I don't know what its doing.

Why does the reset button not seem to reset it ? Is there a "harder" form of reset ? 

Any other suggestions please.