Available here: http://support.asus.com/Download.aspx?SLanguage=en&m=RT-N66U+(VER.B1)&p=11&s=2
ASUS RT-N66U Firmware Version 3.0.0.4.374.257
Fixed:
1. Fixed Centrino 5GHz connection issue.
If the connection problem still exist, please press the reset button more than 5 seconds to reset RT-N66U after firmware upgraded and delete wireless profile on the client devices then create a new wireless connection.
2. Fixed HK ISP DHCP connection issue.
3. Fixed USB application update related issues.
2013.08.14 update
ASUS RT-N66U Firmware Version 3.0.0.4.374.257
Fixed:
1. Fixed Centrino 5GHz connection issue.
If the connection problem still exist, please press the reset button more than 5 seconds to reset RT-N66U after firmware upgraded and delete wireless profile on the client devices then create a new wireless connection.
2. Fixed HK ISP DHCP connection issue.
3. Fixed USB application update related issues.
2013.08.14 update