Updating J-Web Interface on EX Series Switches (J-Web Procedure)
You can update the J-Web software packages on a single fixed-configuration switch or for all members of a Virtual Chassis.
You can use the J-Web interface to install the latest Application package that is associated with the installed Junos OS, by uploading the file to the switch.
Installing J-Web Application Package by Using Manual Update
To manually check for and install the latest J-Web Application package: