I installed 4.5 but switched back to 4.3. The 4.5 OS had too many bugs. There were issues with inputting text when I was browsing. It shut off and rebooted when I tried to play a Youtube vid. I was willing to deal with those issues until I tried to send a text msg and got the big red X! There were things I could've tried to fix it but didn't feel like dealing with it, even though I was loving Docs To Go! So now I'm using 4.3 til the official version of 4.5 drops for VZW.