[Official] RT-AC66U Firmware version 3.0.0.4.378.9533

Bug fixes
- Fixed Multicast issue when WAN is PPPoE/ PPTP/ L2TP
- Fixed IPTV GUI issue
- Fixed two guest networks had same mac address problem.
- Fixed view list in network map cannot be closed.
- Fixed network map device icon issue
- Fixed client cannot get new IP when changed router IP and subnet mask.
- Fixed wrong notification when using quick internet setup wizard in static IP environment.
- Fixed wrong notification when client was blocked by Time scheduling.
- Fixed DNS response error...

[Official] RT-AC66U Firmware version 3.0.0.4.378.9533