How to downgrade Unifi Controller Software

  1. You need a backup file from the version you want to downgrade. If you haven`t, you can stop here.
  2. SSH into your controller
ssh {user}@{controller-ip}
  1. Removed existing downloads
rm -f unifi_sysvinit_all.deb*
  1. Uninstall current controller package
apt purge unifi -y
  1. Download old controller package (replace version in url with your needs)
  1. Install package
dpkg -i unifi_sysvinit_all.deb
  1. Remove download
rm unifi_sysvinit_all.deb
  1. Access UniFi Controller WebUI and restore backup