Downgrading the Firmware with the CLI

Occasionally, downgrading the JUNOS software might require you to downgrade the firmware on interfaces. To downgrade firmware using the CLI:

1. Log into the Services Router that requires the firmware downgrade.
2. Using FTP, copy the downgradable firmware file package from your server to the temporary folder on your Services Router called /var/temp.
3. Using the request system software delete jfirmware command, delete the existing firmware files on the Services Router.
4. Using the ls /usr/share/pfe/firmware command, verify that the firmware is deleted.
5. Using the request system software add /var/temp/jfirmware-jseries filename-signed.tgz command, install the downgradeable firmware package on the Services Router.
6. Using the show version detail command, verify that the firmware package is installed:
   user@host> show version detail

   hostname: servicesrouter
   		 Model:J4300
   		 JUNOS Software Release: [[7.2I20050612.0]
   		 systest.pepsielf.pkg: Created by pkg_create script
   		 jfirmware: JUNOS Firmware Software Suite [7.2I20050024_1127_signed]
   	 	 KERNEL 7.2R1 built by builder on 2005–03–30 16:32:44 UTC

7. Using the ls /usr/share/pfe/firmware/ command, verify that the firmware binary files are present in the folder.
8. Enter show system firmware to display the installed PIMs on the Services Router.
9. Issue the request system firmware upgrade pic fpc-slot number pic-slot 0 tag number command, downgrade the firmware on the selected PIM.

   Be sure to downgrade each tag on the PIM.

10. Upgrading takes a few minutes, and you can check the status using the show system firmware command until upgraded successfully is displayed next to the selected PIM.

    Repeat Steps Step 9 and Step 10 for each tag on the PIM.

11. Restart the PIM using the request chassis fpc slot number restart command.
12. Using the show system firmware command, verify that the firmware is downgraded.