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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.

Upgrade or downgrade the SRX300 Line of Firewall from Junos OS Release 24.4R1 using a USB flash drive. After rebooting, the device enters an amnesiac state. Therefore, before you install, make sure you have saved the configuration file so that you can more easily reconfigure the device using the console port.

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

  • Upgrade the loader to a build from the year 2023 or later. During the boot process, the loader reveals the build date. For example, this loader was built on May 23, 2023.

To install Junos OS Release 10.0 or later from the boot loader 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 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 configuration or insufficient space for the new image. Console access is required to troubleshoot.

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