I am having problem with my modem. I am using c2110 modem. I have upgraded its firewall few days ago. But now whenever I try to do port forwarding it fails. So I want to downgrade to the older version to do port forwarding. So right now I want v55.1.04.02 or V55.1.03.06 , my friend told me that this versions will provide port forwarding. And other question about it . if I downloaded one of them will I have to configure it after installation or will it do setting automatically. So I need help for reconfiguring it. So please provide me the solution.