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


Code Block
titleno-validation
collapsetrue
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


SRX software upgrade and issues ( snapshot media )


Code Block
titlesoftware rollback
collapsetrue
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


Check Partition first:

root@SRXbuffalo> show system snapshot media internal
Information for snapshot on internal (/dev/da0s1a) (primary)
Creation date: Aug 21 15:05:08 2018
JUNOS version on snapshot:
junos : 18.2R1.9

Information for snapshot on internal (/dev/da0s2a) (backup)
Creation date: Jan 3 12:49:35 2018
JUNOS version on snapshot:
junos : 17.4R1.16