Can you go to any other web sites?
What FW version did you have before? What was the reason for updating FW? Was the web sites working before the update?
Has a Factory Reset been performed before and after the FW update?
What ISP Service do you have? Cable or DSL?
What ISP Modem do you have? Stand Alone or built in router?
What ISP Modem make and model do you have?
Is IPv6 enabled on your PC? Does your ISP support IPv6, if not, then IPv6 needs to be disabled on your PC.