Hi,
I manage several EX series switches. I have been working on getting these to JTAC recommended versions.
This includes a few EX2200's. They're mostly running 15.1, but I have been slowly moving them to 12.3.
Most of these downgrades are completely fine. I install the update and schedule a reboot.
However, two of them are being difficult. I install Junos 12.3, which appears successful. I then reboot the switch, which takes over 30 minutes (abnormal even for these little switches).
After the reboot, they're still running 15.1, and I can't figure out why.
Does anyone have any suggestions on what I can try next?