The switch will unpack the files, validate the package, install the OS, and reboot. This process takes several minutes (usually 5–10 minutes). Do not power off the switch during this time.
Model: ex2200-24t-4g Junos: 12.3R12-S15
The downloaded file name usually follows the pattern: junos-install-EX-ex2200-12.3R12-S21.tgz . Do not rename it; keep the checksum integrity. juniper ex2200 firmware download