1.20 doesn’t work for me either. Very disappointing. Maybe some combination of settings might do the trick but I don’t have time to experiment.
My Netgear WNR3500 worked very well while it worked except the entire network would just drop out randomly and come back – both wired and wireless connections. Now it seems to have stopped connecting to the internet which is why I tried the 1.20 firmware on my otherwise unused DIR-655.
Looks like I’ll have to get a replacement from Netgear.