Ok, first I downloaded and ran: WRT54GV4.0_4.20.7_US_code%2C1.exe. My WRT54G is at v1.00.0. When I click upgrade, I get the message "Invalid code pattern". Went back to linksys and downloaded WRT54GV4.0_4.20.7_US_code%2C1.zip and befsx41_Tftp.exe, extracted the bin file from the zip file and ran befsx41_Tftp.exe. Again, when I click upgrade, I get the message "Invalid code pattern". FInally, I tried going through a browser to do the upgrade from the router using the bin file, "Upgrade failed". Help! Please!!!