ds2cd2132-i 3mp

Hello, I recently bought 6 of DS2CD2132-I 3MP IR Fixed Focal Dome Camera 2.8 mm, US version. I need to buy a couple more with lens that can zoom in a little farther like 6 mm or 12 mm and I come upon varifocal DS-2CD2732F-I, but this version comes with warning not to upgrade the software, or it...