How to #Upgrade Juniper #SRX Firewall #Software :
$ scp username@[IP ADDRESS OF THE FTP SERVER]:junos-srxsme-20.4R1.12.tgz /var/tmp/junos-srxsme-20.4R1.12.tgz
$ request system software add no-copy /var/tmp/junos-srxsme-20.4R1.12.tgz
$ request system reboot