UniFi - How To Reload a UAS using the ISO and USB


This article demonstrates how to use the ISO downloaded from the Ubiquiti website to restore the UniFi Application Server (UAS) to factory defaults with the latest UniFi and UniFi Video software packages.


Performing this procedure will reset the UAS to defaults. UniFi, UniFi Video, and IPMI will all be defaulted and set to the version included in the ISO. Any required backups of UniFi and/or UniFi Video should be made before you perform this procedure. This article assumes you know your IPMI credentials. This process can also be completed using Remote Control > iKVM/HTML5 if desired.


Devices used in this article:

Table of Contents

  1. Download the Latest ISO
  2. Copy the ISO to the USB drive
  3. Log in to IPMI or connect a monitor
  4. Boot into the BIOS
  5. Reboot the Server
  6. Power On the Server Using IPMI
  7. Configure the Server
  8. Default Credentials Post Flashing
  9. Related Articles

1. Download the Latest ISO

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You can find the latest ISO available at the UBNT Downloads page. Note that the image is upwards of 1GB in size so it may take some time to download over slower internet connections.

2. Copy the ISO to the USB Drive

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NOTE: Keep in mind that you will need a 2GB flash drive at minimum.

There are multiple tools available to flash a USB drive with a drive image. Some examples are: Etcher, Win32DiskImager, UNetBootIn, dd, etc. This article uses Etcher, but you’ll need to make sure that whatever tool you use writes a bootloader onto the USB drive or this process will not work.

1. Insert the USB drive into your computer.

2. Open Etcher.

3. Select the ISO that you downloaded.


4. Make sure that you have the correct drive for your flash drive selected.


5. Click the Flash button.


6. This process will take approximately 5 minutes to write and validate the integrity of the flash.


7. Unplug the USB drive from your computer. Once you have flashed the UAS, you may reuse the flash drive. Simply plug it in to your computer, delete any existing partitions, and create new partition(s) per your requirement.

3. Log in to IPMI or connect a monitor

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If you do not have your IPMI interface connected, you can simply connect a monitor to the VGA connector on the back of the UAS.  If you do this, please proceed to step 5.

Visit https://[your IPMI IP address].

NOTE: If you do not know your IPMI IP address, please reference your DHCP lease table to locate it. Note that this address is not the main interface address used to access UniFi and/or UniFi Video.

Log in using the credentials you supplied when you initially configured the device. The username should be ubnt and the password should be what you configured for UniFi and/or UniFi Video. Default credentials are ubnt/ubnt.


4. Boot into the BIOS

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Once the download is finished, follow these steps to attach the ISO:

1. Mouse over Remote Control.

2. Click Console Redirection.

3. Click Launch Console.

4. Click the newly downloaded .jnlp file.

5. Accept any warnings that may come up.


5. Reboot the Server

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1. Plug your USB flash drive into the UAS.

2. Power Reset the server using IPMI or via the power button on the front of the UAS.


3. When you see the following screen, tap F11 continuously, to invoke the one-time boot menu.


4. At the following screen, use your arrow keys to highlight the entry that corresponds to your USB drive (typically contains the manufacturer name or model of the drive), then press Enter.


5. Wait while the process completes.


6. When the process completes, the server will show you a black screen via IPMI, displaying ‘No Signal’ in the window’s title bar.

7. Disconnect the USB flash drive from the UAS.

6. Power On the Server Using IPMI

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7. Configure the Server

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1. Enter the username at the prompt (ubnt)

2. Enter the password at the prompt (ubnt)

3. Change your password (forced)

3.1 Enter your current password (ubnt)

3.2 Enter your new password

3.3 Confirm your new password

4. Find the IP address with:

ifconfig -a

5. Visit https://[IP address from step 4]:7443 to setup UniFi Video

6. Visit https://[IP address from step 4]:8443 to setup UniFi

Default Credentials Post Flashing

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After flashing, the default credentials will be:

IPMI: ubnt/ubnt

SSH: ubnt/ubnt

UniFi Video: None, you establish them at the Startup Wizard for UniFi Video

UniFi: None, you establish them at the Startup Wizard for UniFi

Related Articles

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UniFi Video - Recording Backup Options

UniFi - What is included in the backup file?

UniFi - How can I restore a backup configuration?

UniFi - How To Reload a UAS using the ISO and IPMI