Ubnt Compliance Test Mode. How to Turn On detail step by step instructions.
Step 1: you need to download Putty Software
Step 2: connect the device from putty
Step 3: enter command touch /etc/pesistent/ct then hit enter
save
reboot
close putty
now go to wireless tab
we have only few frequency available. now change to compliance test
now it has all the frequency for 2.4ghz band
you can improve your system by testing each and every frequency and select the best one..