WiFi channel disappears when I tried to connect to a 5Ghz WiFi


i have retina macbook pro 13" 11,1 model. found can't connect friend wifi 5ghz. network tried take @ , found weird.

1. @ first mbp can see 5ghz wifi network when try connect it, failed , after mbp can't see network again.

2. have remove configuration in "/library/preferences/system configuration" folder restart. after restarting mbp can see network failed connect , can't see again.

3. took @ system information. in wifi section saw supported channels data.

3.1 before try connect 5ghz network , while mbp can see network supported channel listed 165 (which channel wifi using)

3.2 after try connect , failed, 165 channel disappear supported channel list



hardware issue or software , how can fix it?



machine information

- retina macbook pro 13" 11,1 model

- os x el capitan beta 4

- note issue occurred since yosemite 10.10.3


macbook pro retina display, os x yosemite (10.10.4)
 

if going use 165 router needs set 40mhz or 20mhz (whichever not set right now), or pick lower channel
 


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