Site upgrade initiated from CLI because the image upgarde failed from CSO due device issues.

CSO upgrade initiated but device did not boot with specific image and stayed on old version

Upgrade Workflow:
(Reference: https://www.juniper.net/documentation/us/en/software/cso6.3.0/cso-cp-user-guide/topics/task/cp-sites-upgrading.html )

CSO initiates the Upgrade process by uploading the file from CSO to device Or user manually updates the image to device.

Note: A CPE(vSRX) runs as a virtual entity on an NFX device 
 

In an event, upgrade needs to be done manually from virtual vSRX CLI, the same should never be done via SSH but over a console session initiated via JDM.

Note: In NFX250 JDM is Junos Device manager maintaining the PFE and the vistualized environment which runs VM as vSRX in this case.
 

Best practice is to perform a console from JDM using following procedure:

{master:0}

root@jdm> request virtual-network-functions console ?

Possible completions:

 <vnf-name>          VNF name

This way user can make sure to attend to any error that comes up during the upgrade process.