This article explains how to recover if there's an upgrade failure on SRX device

While trying to perform an upgrade getting following error

ERROR: Host Upgrade failed!

ERROR: upgrade failed

ERROR: junos-srx-img fails post-install

ERROR: junos-srxmr-x86-64-21.2R3-S7.2-signed fails post-install

Installation failed for package '/var/tmp/junos-srxmr-x86-64-21.2R3-S7.2.tgz

The upgrade is failing because there is some pending upgrade in the kernel

• To roll back the upgrade log into shell using root credentials

start shell user root

• Then login to the Linux operating system using the root password again:

ssh -JU __juniper_private4__ [email protected]

password:

• Once logged in, issue the following command for rollback:

upgrade_platform -r

Exit from the Linux prompt and from the shell prompt. Then run the upgrade once again.