After googling a bit, I understood I need to download a version of OS, load it to USB and boot the router from there. However, I failed downloading the OS from the software central without having the service contract for the device... And the CISCO technical support have guided ...
Without FW it hard. The TCP is only two way traffic (sure icmp also but icmp os only for test) you try acl tcp with established keywords And deny any udp and tcp traffic to pass from outside to inside MHM 0 Helpful Reply MHM Cisco World VIP In response to MHM Cisco World ...