How to Downgrade Unifi Controller

1. Download the desired application update from community.ui.com/releases.
2. SSH into your device.
3. Run the following command :

unifi-os shell

1. Remove previously installed files:

rm /tmp/unifi_sysvinit_all.deb &> /dev/null

1. Store the new application version on your device using the download link:

curl -o "/tmp/unifi_sysvinit_all.deb" <network application link.deb>

1. Example:

curl -o "/tmp/unifi_sysvinit_all.deb" https://dl.ui.com/unifi/6.2.26-a79cb15f05/unifi_sysvinit_all.deb

1. Once downloaded, install the new version:

apt-get install -y /tmp/unifi_sysvinit_all.deb

1. Following installation, remove the downloaded file:

rm /tmp/unifi_sysvinit_all.deb