Installing Junos Software Packages
SRX Series devices can provide the security defined by Federal Information Processing Standards (FIPS) 140-3 Level 2 if these devices are operated in the Junos OS in FIPS mode.
Junos OS is delivered in a signed package that contains a digital signature to ensure that a valid Juniper Networks software is running. When installing a software package, the Junos OS validates the signature, and the public key certificate used to digitally sign the software package. If the signature or certificate is found to be invalid (for example, when the certificate validity period has expired or cannot be verified against the root CA stored in the Junos OS internal store), the installation process fails.
To install the Junos OS software package, install the Junos OS on your device using the following CLI command:
request system software add /<image-path>/<junos package> no-copy no-validate reboot.
When upgrading to Junos OS 24.4 from an earlier version, the file system of the TOE must also be upgraded. This involves several additional steps which must be taken by the administrator. The detailed guidance on the file system upgrade is given in the following:
https://supportportal.juniper.net/s/article/Upgrading-the-srx3xx-branch-series-devices-to-Junos-24-4.