How To Migrate/Move Ubiquiti Unifi Access Point to a New Controller (v2.x)

How To Migrate/Move Ubiquiti Unifi Access Point to a New Controller (v2.x)
Prerequisites:
determine the IP address of the access point
this should be listed in the current controller
optionally, you can scan the network looking for it
nmap 192.168.42.0/24 |grep Ubiquiti -B 5
nmap 192.168.42.0/24 -p 22 -oG - |grep open
be logged in to the new Unifi Controller website

Steps:
ssh into the access point using the admin credentials the current controller software uses (typically “admin” for the username and whatever password is assigned). For example: ssh admin@192.168.42.71
reset the AP to the system defaults by running “syswrapper.sh restore-default”. The AP will run through a quick series of commands that look like this and then reboot.
ssh into the access point again after about 20 seconds using the ubiquiti defaults - username: “ubnt”, password: “ubnt”.
use the mca-cli utility to manually set the controller address:
after logging in type “mca-cli” and hit Enter
at the UniFi# prompt type “set-inform http://mtwifi1.maytechgroup.com:8080/inform” and hit Enter
Browse to the Ubiquiti Unifi controller website - https://mtwifi1.maytechgroup.com:8443. Before running the set-inform command, it should show 0 pending devices:  but afterwards, it should show 1 pending device:
Click on the link of the MAC address of the pending access point to adopt the device and click the adopt button.

The state of the access point will change to “Adopting”. Wait until the state changes to “Disconnected” before moving on to the next step.

After the state shows disconnected, wait 1 more minute and then go back to your ssh session and run the set-inform command again
set-inform http://mtwifi1.maytechgroup.com:8080/inform
type “exit” to leave the mca-cli utility

Monitor the progress of the rest of the migration in the controller website. Within seconds of running the set-inform command the second time, you should see the status of the AP change to “Upgrading” (if a firmware update is applicable) and then to “Provisioning”. After a minute or two, you should see the final status of “Connected”.



Last step is to go to the Configuration tab of the AP in the controller website and assign it an alias that will make it easier to track. Name it based on location and floor assignment.