Issue has been resolved already, I just updated the firmware from ver 1.65 to ver 1.75.
Another question, Is it possible to setup WCR-GN as the Base Station and WZR-HP-G300NH as the slave. I tried to, however, WZR-HP-G300NH? can't find the wireless network name for WCR-GN.
***All answers are highly appreciated. Big Thanks!