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JUNOS Download

Before upgrading

show version
show chassis hardware | no-more
show chassis environment | no-more
show interface terse | no-more
show configuration | no-more | display set

Check system alarms and regarless of result run request

show system alarms
request system configuration rescue save
request system autorecovery state save

Check chassis alarms

show  chassis  alarms
show system storage partitions
request system snapshot slice alternate
show system snapshot media internal
request system reboot
show chassis alarms

Make sure you have enough storage before upgrading /var

show system storage | no-more

If need more space, check files dry-run

request system storage cleanup dry-run

If all good to delete in results above, then run it. if not needed then ignore this step

request system storage cleanup

Enable services & Connect to SRX through FTP & upload firmware file to Juni, might need to update the security zone command, for zone name and interface

configuration
set system service telnet
set system service ftp
set security zones security-zone MGMT interfaces irb.1234 host-inbound-traffic system-services ftp
commit

You have 3 methods below, use only one!

Method 1: Upload the file into /var/tmp/ directory using filezilla or winscp and then check if you can see it

run file list /var/tmp/
request system software add /var/tmp/junos-srxsme-12.1X46-D40.2-domestic.tgz no-validate

Method 2: FTP Method

request system software add ftp://ftpuser:ftppass@172.16.1.1/junos-srxsme-12.1X46-D40.2-domestic.tgz no-copy no-validate

Method 3: HTTPS Method

file copy "https://cdn.juniper.net/software/junos/20.4R3.8/junos-srxsme-20.4R3.8.tgz?SM_USER=username@domainname.com&__gda__=1674734823_bd7351a3514eb61069sad8yoasd9" /var/tmp/junos-srxsme-20.4R3.8.tgz

request system software validate /var/tmp/junos-srxsme-20.4R3.8.tgz

request system software add /var/tmp/junos-srxsme-20.4R3.8.tgz no-validate

Reboot after choosing your method

request system reboot

It can take 10-15 minutes before becoming available again, after it's back run the below

show version
show system boot-messages | no-more
show chassis hardware | no-more
show chassis environment | no-more
show interface terse | no-more

Check DHCP Leases

show arp no-resolve

extra sources