How to Reset and Update a UniFi Cloud Key Gen1 (Complete Guide)

If you manage older UniFi environments, you’ve probably run into a frustrating issue: legacy Cloud Key Gen1 devices that are too outdated to connect to the UniFi Portal. This can leave you completely blind when trying to manage a client’s network.

After working with many of these devices in production environments, here’s a practical, step-by-step guide to resetting and updating a UniFi Cloud Key Gen1 so it can be brought back into a manageable state.

⚠️ Before You Start

Unifi Cloud Key Gen2 Plus SSD Model (UCK-G2-SSD)

Strong recommendation:

If possible, replace the Cloud Key Gen1 with a newer model (preferably one with SSD storage). The older HDD-based units are prone to failure and performance issues. Here is the one I recommend (UCK-G2-SSD):

Links: Amazon.com*

If upgrading isn’t an option, proceed with the steps below.

Step 1: Attempt Access via SSH

To update the device, you’ll need SSH access.

Use an SSH client (like PuTTY or Terminal)
Connect to the Cloud Key’s IP address

Default credentials (after reset):

username: root
password: ubnt

If you still have the original credentials, use those instead.

Step 2: If You Don’t Have SSH Access

If the root password is unknown:

Log into the UniFi web console (if accessible)
Export the current configuration:
- Go to Settings → System → Backup
- Download a backup file
Perform a factory reset on the Cloud Key:
- Hold the reset button until the device reboot

Unifi Cloud Key Gen1 - Reset Button Location — Unifi Cloud Key Gen1 – Reset Button Location

After reset, SSH credentials will revert to:

root / ubnt

Step 3: If the Device Is Completely Broken

Some Cloud Keys fail due to:

Full internal storage
Corrupted system state

Symptoms:

SSH login fails even with correct credentials
Web UI is unresponsive or inaccessible

Solution:

Export config (if possible)
Perform a full factory reset
Reconfigure from backup after recovery

Step 4: Update the Firmware via SSH

Once you’ve successfully logged in via SSH, run the following commands:

wget https://dl.ui.com/unifi/7.2.97/unifi_sysvinit_all.deb
dpkg -i unifi_sysvinit_all.deb

What this does:

Downloads the latest supported UniFi version for Gen1
Installs it manually (bypassing outdated update paths)

Step 5: Wait for Installation

The upgrade will take several minutes
Wait until the terminal becomes responsive again
Do not interrupt the process

Step 6: Verify the Upgrade

Refresh the UniFi web console
Confirm the version is now 7.2.97

This is the final supported version for Cloud Key Gen1 devices.

Step 7: Reconnect to UniFi Portal

Once updated:

The device should now be able to connect to the UniFi Portal (for now)

⚠️ Note: Support for Gen1 devices may be discontinued at any time.

Final Thoughts

This method provides a temporary way to extend the life of a Cloud Key Gen1, but it’s not a long-term solution.

I’ve been telling my coworkers (and clients who have not upgraded yet) for years that this is a temporary solution and that Unifi could block access to this old controller at any time. That still has yet to happen though so until then you can use this guide to fix and rejoin these devices to the Unifi portal!

Key takeaways:

Version 7.2.97 is the last supported release
Portal compatibility may disappear in the future
Hardware failure (especially HDD models) is common

Best practice: Plan for replacement sooner rather than later.

Quick Summary

Backup config if possible
Factory reset if needed
SSH into device
Run manual update commands
Verify upgrade to 7.2.97
Reconnect to UniFi Portal

If you’re managing multiple legacy environments, documenting credentials and maintaining backups will save you significant time when dealing with aging hardware like this!