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config could be lost !!!
no-validaterequest system software add /var/tmp/junos.15.1X49-D172.tgz no-validate

no-validation
root> ...dacbaaa5280fab71690f9e50aed54" /var/tmp/junos.18.1.tgz
/var/tmp//...transferring.file.........f7eVY3/100% of  307 MB 1674 kBps 00m00s



root> request system software add /var/tmp/junos.15.1X49-D172.tgz no-validate
Formatting alternate root (/dev/da0s1a)...
/dev/da0s1a: 2510.1MB (5140780 sectors) block size 16384, fragment size 2048
        using 14 cylinder groups of 183.62MB, 11752 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
 32, 376096, 752160, 1128224, 1504288, 1880352, 2256416, 2632480, 3008544,
 3384608, 3760672, 4136736, 4512800, 4888864
saving package file in /var/sw/pkg ...
Installing package '/altroot/cf/packages/install-tmp/junos-15.1X49-D172.1-domestic' ...
Verified junos-boot-srxsme-15.1X49-D172.1.tgz signed by PackageProductionEc_2019 method ECDSA256+SHA256
Verified junos-srxsme-15.1X49-D172.1-domestic signed by PackageProductionEc_2019 method ECDSA256+SHA256
JUNOS 15.1X49-D172.1 will become active at next reboot
WARNING: A reboot is required to load this software correctly
WARNING:     Use the 'request system reboot' command
WARNING:         when software installation is complete
Saving state for rollback ...

root> request system reboot
Reboot the system ? [yes,no] (no) yes

Shutdown NOW!
[pid 5379]

root>
*** FINAL System shutdown message from root@ ***

System going down IMMEDIATELY



SRX3xx

Dual boot system

https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/request-system-software-rollback.html

software rollback
On SRX Series devices with dual root systems, when request system software rollback is run, the system switches to the alternate root. Each root can have a different version of Junos OS. Roll back takes each root back to the previously installed image.




request system software system-backup






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