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Upgrade the Bootloader on SRX Series Firewalls

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

To upgrade the bootloader to the latest version:

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

    The Junos OS 10.0 image contain 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. Reboot is required for the new version to take effect.

When your device boots up, check the bootloader version in the console output:

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