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--- ubiquiti:cli:upgrade_controller [2020/10/22 18:13] – created 192.168.1.1
+++ ubiquiti:cli:upgrade_controller [2020/10/22 18:24] (current) – 192.168.1.1
@@ Line 3: / Line 3: @@
 . Navigate to the Ubiquiti [[https://www.ui.com/download/unifi/|Downloads]] page to obtain the UniFi Controller firmware download link.
-. The latest UniFi Controller releases are listed in the Software section.
+. The latest UniFi Controller releases are listed in the **Software** section.
-. Expand the UniFi Network Controller for Debian/Ubuntu Linux and UniFi Cloud Key option and select download.
+. Expand the **UniFi Network Controller for Debian/Ubuntu Linux and UniFi Cloud Key** option and select download.
-. Accept the EULA and copy the firmware download URL. An example URL is:
+. Accept the EULA and copy the firmware download URL. An example URL is: <code>
+https://dl.ui.com/unifi/x.xx.xx_version/unifi_sysvinit_all.deb </code>
+<WRAP info>
+**NOTE:**  You can also obtain the firmware link from the Ubiquiti Community [[https://community.ui.com/releases|Software Releases]] page.
+Open the relevant UniFi Network Controller **General** or **Beta** release page and copy the **UniFi Controller for Debian/Ubuntu and UniFi Cloud Key** link.
+</WRAP>
+. Open a SSH session using your favorite SSH/Telnet client program.
+<WRAP info>
+**NOTE:**  Access the Command Line Interface on the UCK (Unifi Cloud Key) using SSH.
+See the Intro to Networking - How to Establish a Connection Using SSH article for more information on how to connect to the Cloud Key using SSH.
+</WRAP>
+. Navigate to the /tmp directory:
+<code bash>
+cd /tmp
+</code>
+. Verify if there are any previous installation files present in the directory and delete them if applicable:
+<code bash>
+ls -l
+</code>
+<code bash>
+rm unifi_sysvinit_all.deb
+</code>
+. Use the wget command with the previously copied link to download the UniFi Controller installation file and store it in the /tmp directory.
+. Replace https://dl.ui.com/unifi/x.xx.xx_version/unifi_sysvinit_all.deb with the previously copied URL.
+<code bash>
+wget https://dl.ui.com/unifi/x.xx.xx_version/unifi_sysvinit_all.deb
+</code>
+. Wait for the firmware download process to complete and install the new version using the dpkg command:
+<code bash>
+sudo dpkg -i unifi_sysvinit_all.deb
+</code>
+<WRAP info>
+**NOTE:** If the UniFi Controller version needs to be downgraded to an older release, then the currently installed version can be removed with the <code bash>sudo dpkg -P unifi</code> command.
+</WRAP>
+. Wait for the installation process to complete and remove the unifi_sysvinit_all.deb file afterwards.
+<code bash>
+rm unifi_sysvinit_all.deb
+</code>
+----
+===== References =====
+https://help.ui.com/hc/en-us/articles/216655518-UniFi-UDM-UCK-How-to-Change-the-Controller-Version-Using-SSH-
-https://dl.ui.com/unifi/x.xx.xx_version/unifi_sysvinit_all.deb