SSH into CPE

ssh ubnt@192.168.1.20

open up the “/tmp/system.cfg” file

vi /tmp/system.cfg

Find the “radio.1.chanbw=” line and change to the following

radio.1.chanbw=10

Note: it may say “radio.1.chanbw=0” that looks to be the default and works for 20mhz

exit file with

esc + :wq + Return or Enter

Save settings with

/usr/etc/rc.d/rc.softrestart save 

Change AP to 10Mhz and the CPE should reconnect.