UniFi Cloud Key firmware 0.5.9 is released


**How to play safe?**Make sure you always do a backup before any updates, especially if you plan to upgrade your existing installation.
Once you upgrade the firmware the controller will be on 5.3.8, so if you were on something older, or newer then you’ll need to reinstall that controller version and then restore your backup.
**Using UniFi v4.8.X or Beta / Alpha?**If you prefer to upgrade the firmware but still wish to continue using v4.8.X, create a backup of your controller prior to upgrading, upgrade the firmware, purge unifi, install v4.8.20 using the .deb file, then restore your controller backup during the setup wizard. This method will avoid the need to downgrade your controller, which isn’t supported.
**Notes:**All system customizations are removed on firmware upgrade. This would include the UniFi VoIP controller, if you have it installed. Please make sure to backup your VoIP controller configuration, and any other customizations prior to firmware upgrade.
**Changes in 0.5.9:**UniFi Controller

  • Bundle UniFi Controller 5.3.8. See HERE for controller release notes.

UCK System

  • Update bundled Oracle Java 8 (1.8.0u101>1.8.0u111).
  • Patch dirty COW (CVE-2016-5195) vulnerability.
  • Garbage collection for aufs pseudo-links.


  • No changes.

How to update the latest firmware:

  • From UniFi Cloud Key WebUI: Maintanance -> CHECK FOR UPDATES (in FIRMWARE section) -> UPDATE NOW.
  • From UniFI Controller: Settings -> Maintenance -> CHECK FOR UPDATES (in CloudKey Firmware section) -> APPLY UPDATE
  • From UniFi Cloud Key WebUI: Maintanance -> Update Manually>, and enter the URL in the link below. You can also download the BIN and upload the BIN file.

UniFi Cloud Key firmware can manually be found HERE. It’s md5 sum is: 3a60de61aae7ad8b4796827a99919440
Note, what is meant by the UniFi Cloud Key WebUI is the actual local management of the CK itself. Please visit it’s IP in a browser and you’ll have two options. The bottom option (Configure) is how yhou access the local management page.
This is a manual download for the first week. After that time it will be pushed to the repo for the normal upgrade methods available in both the CK maintenace page and the UniFi controller.