After resetting to factory setting and restoring my backup, I have this same problem, wired connection is ok, but none of the laptops can connect to router via wireless. 802.11 mode was already set to "Mixed 802.11n, 802.11g and 802.11b", but it still doesn't work. I tried changing it to just "Mixed 802.11n and 802.11g", still no success. From my laptop, it actually shows the router connection available with excellent signal strength, but it's unable to connect.