Today I found iPhone 6 A1549 dropped 2.4GHz,so I decide to use 5GHz for my Apple Device.WDN4800 connect to WNDR4300v2 with 2.4GHz before,change Region from China to United States because China does not have Channel 36,change 5GHz Channel from Auto to 36,WDN4800 is 5GHz now,thank you.