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Upgrade the Boot Loader on SRX Series Firewalls

Learn about installing Junos OS on SRX Series Firewalls using a USB flash drive, including prerequisites, boot loader updates, and step-by-step installation instructions.

To upgrade the boot loader to the latest version:

  1. Upgrade to Junos OS Release 10.0 or later (with or without dual-root support enabled).

    The Junos OS 10.0 image contains the latest boot loader binaries in this path: /boot/uboot, /boot/loader.

  2. Enter the shell prompt using the start shell command.
  3. Run the following command from the shell prompt:

    bootupgrade –u /boot/uboot –l /boot/loader

    You can use the following commands to upgrade U-Boot or perform a cyclic redundancy check (CRC):

    • bootupgrade -s -u – To upgrade the secondary boot loader.

    • bootupgrade -c u-boot – To check CRC of the boot loader.

    • bootupgrade -s -c u-boot – To check CRC for the secondary boot loader.

    • bootupgrade -c loader – To check CRC for the loader on boot loader.

  4. Enter the show system firmware command to check whether the upgrade is successful or not.
  5. Reboot the system after upgrading the boot loader. This is required for the new version to take effect.

You can check the boot loader version number at console output when your device boots up as shown in the following example:

To verify the (BIOS) firmware version on the SRX Series Firewall, enter the show chassis routing-engine bios command.