SOLVED: VIDEO: Step By Step Firmware Upgrade Process For Juniper EX3400 Switch
If you are an Windows admin that needs to periodically deal with network gear, you may be overwhelmed by the complexity of the Juniper firmware upgrade process.
We have the video below that goes through the entire process, including how to source the firmware. Below that video are all of the steps and commands so you can copy paste into your Putty Serial Connection:
How to Update Firmware on a Juniper EX3400 Switch
Prework:
Download the Juniper EX firmware
Download Putty
If and only if you have a Juniper EX2300 or EX3400 you also need some additional files as per Juniper KB31198