====== Ubiquiti - Controller - Downgrade Controller ======

<WRAP alert>
**ALERT:**  This is NOT supported, so at own risk!

You cannot downgrade controllers unless you have a backup from the controller version you want to downgrade to (or older).

Always make a backup (suggest - settings only) to your PC before upgrading or downgrading so you can get back where you were.
</WRAP>

<WRAP info>
**NOTE:** If you do not have a backup - then you will need to factory reset your devices, adopt and configure like a new setup.
</WRAP>

----

===== Make a Backup =====

Make a controller backup of settings only from the Backup tab and save it to your PC - so if anything goes wrong - just factory reset and restore.


----

===== Downgrade the Controller =====

SSH into the Cloud Key's IP and load the previous controller.

<code bash>
ssh ubnt@192.168.1.10
ubnt@192.168.1.10's password: 
</code>

<code bash>
apt purge unifi -y
rm unifi_sysvinit_all.deb*
wget https://dl.ui.com/unifi/5.14.23/unifi_sysvinit_all.deb
dpkg -i unifi_sysvinit_all.deb
rm unifi_sysvinit_all.deb
</code>

<WRAP info>
**NOTE:**  Replace the version in the wget line with the version you want.
</WRAP>

----

===== Import your settings backup =====

<WRAP info>
**NOTE:**  If you get an error when you try to restore the backup:

  * "There was an error uploading the backup file. The backup file you are trying to load is from a newer version of the UniFi Controller and cannot be used with this controller".

The restore is not functioning because you're uploading a newer controller backup on an older controller, that is not supported.

To resolve this issue, update the firmware to a version higher or equal to the version of your backup.

</WRAP>

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===== Check Logs =====

If you have issues, then check the logs:

<code>
/usr/lib/unifi/logs/

tail /var/log/unifi/server.log
</code>

----