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Install Junos OS on SRX300 Line of Firewalls from the Boot Loader Using a USB Storage Device

Learn how to install Junos OS on SRX Series Firewalls from the boot loader using a USB storage device, including prerequisites, U-Boot updates, and step-by-step installation instructions.

When you use a USB flash drive on SRX300 Line of Firewalls for an upgrade to Junos OS Release 24.4R1 or a downgrade from this release, a firewall comes up in amnesiac state after reboot. Therefore, before installing the software, you must save the configuration file so that you can easily reconfigure the device by using the console port.

Before upgrading to Junos OS Release 24.4R1 or later for SRX300 Line of Firewalls, you must first upgrade the U-Boot software to at least version 3.15.

  • Upgrade the bootloader to a build from the year 2023 or later. During the boot process, the bootloader reveals the build date. In the following example, you can see the build date as May 23, 2023.

To install Junos OS Release 24.4 or later from the bootloader using a USB storage device:

  1. Format a USB storage device in MS-DOS format.
  2. Copy the Junos OS image onto the USB storage device.
  3. Plug the USB storage device into the SRX Series Firewall.
  4. Stop the device at the loader prompt and issue the following command:

    An example of a command is as follows:

    This procedure formats the internal media and installs the new Junos OS image on the media with dual-root partitioning.

  5. Remove the USB flash drive.

On SRX300 Line of Firewalls, frequent plug and play of USB keys is not supported. You must wait for the device node creation before removing the USB key.

If an installation error occurs, the LEDs turn red, indicating a corrupted Junos OS image on the USB flash drive. The error might also result from an incompatible SRX Series Firewall or insufficient space for the new image. You require console access to troubleshoot the error.

If the USB storage device is not recognized, you might see an error message such as Target device selected for installation: internal media cannot open package (error 2). In this case, power cycle the SRX Series Firewall with the USB device inserted and retry the installation using the bootloader.