First we’ll need to ssh into the device

ssh ubnt@192.168.1.20

Next lets open up the config file

vi /tmp/system.cfg

Now search for vlan and replace the vlan id with the appropriate number

In VI you can search by hitting / and then type in vlan

After you have changed all the vlan ids, save the file with esc, wq, enter.

Now we can save the config with

cfgmtd -f /tmp/system.cfg -w && reboot