Search our Knowledge Base for "blacklist" commands to specify which channels to use or not use on SmartZone or ZoneFlex APs.
In your case, you would use these commands to check and configure the settings on your 5GHz radio.
You didn't say what model AP you have. Indoor and Outdoor APs support different channels.
You can run this full set of commands, and the ones that don't apply won't work (but doesn't
hurt). There is no channel 134 at your disposal, but these commands leave channel 64, 132,
and 136 turned on for use.
From the rkscli: AP prompt.
set blacklist wifi1 clear
set blacklist wifi1 36 -1
set blacklist wifi1 40 -1
set blacklist wifi1 44 -1
set blacklist wifi1 52 -1
set blacklist wifi1 56 -1
set blacklist wifi1 60 -1
set blacklist wifi1 100 -1
set blacklist wifi1 104 -1
set blacklist wifi1 108 -1
set blacklist wifi1 112 -1
set blacklist wifi1 116 -1
set blacklist wifi1 140 -1
set blacklist wifi1 149 -1
set blacklist wifi1 153 -1
set blacklist wifi1 157 -1
set blacklist wifi1 161 -1
set blacklist wifi1 165 -1
get blacklist wifi1