Hi guys,
I'm a newbie here with Juniper switches please don't get too hard on me. 
Ok, so we just took over a property with a bunch EX2200 for their Access Point.
I'm trying to upgrade the JUNOS because I think it's pretty old.
The current version is 12.1R5.5 and I'm seeing I can have it upgraded to 12.3 or 14 or even 15 version.
So I did try it slowly by using the 12.3 version first by using the Web GUI.
I did the Maintenance -> Software -> Upload Package -> Upload and Install Package.
I uploaded and install the 12.3R12 version of firmware but for some reason I don't think it's updating because after rebooting the switch manually, I'm still seeing the current 12.1 version Junos.
Am I missing something here, guys?
I know this is probably pretty easy problem to fix.
Any help would be appreciated.
Thank you!!