Problem with firmware signatures

Hi can anybody help

when trying to jail break. Atv2   I find when it gets to the point of downloading firmware signatures. I get  a message  saying unable to fetch signatures from the Cydia servers. Have checked the firewall cutting are off.  Am now stuck


Did you save the signatures?


Did you save the signatures?


no I don't think so. I am new and green this stuff. Is it now us.