https://support.juniper.net/support/downloads/
...
Copy the file to the ACX ( SFTP )
set system name-server 8.8.8.8
file copy "release & user specific link to software" /var/tmp/image-name.tgz
request system software
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validate /var/tmp/
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image-name.tgzrequest system software add /var/tmp/image-name.tgzrequest system reboot
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root@ACX5048-1> request system software validate /var/tmp/jinstall-host-acx5k-18.2R1.9-signed.tgz
{master:0}
root@ACX5048-1> request system software add /var/tmp/jinstall-host-acx5k-18.2R1.9-signed.tgz
Verified jinstall-vjunos-18.2R1.9.tgz signed by PackageDevelopmentRSA_2015
Adding vjunos...
Saving contents of boot area prior to installation
WARNING: This package will load JUNOS 18.2R1.9 software.
WARNING: It will save JUNOS configuration files, and SSH keys
WARNING: (if configured), but erase all other files and information
WARNING: stored on this machine. It will attempt to preserve dumps
WARNING: and log files, but this can not be guaranteed. This is the
WARNING: pre-installation stage and all the software is loaded when
WARNING: you reboot the system.
POST-INSTALL...
Saving the config files ...
NOTICE: uncommitted changes have been saved in /var/db/config/juniper.conf.pre-install
Pushing installation package to host...
Upgrade Host OS to 18.2R1.9...
./jinstall-acx5k-18.2R1.9.img.gz: OK
/boot/boot
Extracting image...
Host upgrade staging completed. Need reboot to complete upgrade installation.
WARNING: Changing next boot to SSD0
WARNING: Changing boot device enable from 0x3F to 0x3F
Install jinstall-vjunos completed
WARNING: A REBOOT IS REQUIRED TO LOAD THIS SOFTWARE CORRECTLY. Use the
WARNING: 'request system reboot' command when software installation is
WARNING: complete. To abort the installation, do not reboot your system,
WARNING: instead use the 'request system software delete jinstall'
WARNING: command as soon as this operation completes.
Saving state for rollback ...
{master:0}
root@ACX5048-1> request system reboot
Reboot the system ? [yes,no] (no) yes
Shutdown at Wed Sep 26 13:56:20 2018.
[pid 3570]
{master:0}
root@ACX5048-1>
*** System shutdown message from root@ACX5048-1 ***
System going down in 1 minute
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