If you get the prompt for the bootloader / diag mode you can try to roll back the upgrade. But you will need a copy of the older version to do so from the prompts.
https://kb.juniper.net/InfoCenter/index?page=content&id=KB5519
If you get the prompt for the bootloader / diag mode you can try to roll back the upgrade. But you will need a copy of the older version to do so from the prompts.
https://kb.juniper.net/InfoCenter/index?page=content&id=KB5519