By the way, I was never able to upgrade (past 1.08) via WiFi (even though previous WiFi updates worked fine).
However, I did successfully upgrade (to 1.11) by plugging my netcams into my WiFi router via an Ethernet cable. Two of the three cams updated on the first try. The third hung after the FW upload finished (same problem as via WiFi), but succeeded on the second attempt. Windows 7 SP1, Chrome 34.0.1847.131 m.
It's always best to use a wired connection for FW upgrades anyway to avoid potential issues.