A problem I have

I went to home and then its said update the new update. I clicked on it and it turned off and nothing happend then I tried to go to home again the same thing happen. Then I went to system update but there is no updates Why cant I go on home. And I was watching e3 and the guy said something about not being there at e3 but u can go on it on the ps3 how do I do that.

How do I Uninstall and reinstall like delete home then add home again

Triangle and delete. Then just open it back up. But when I tried to open it it said it was down for some "essential maintenance" :?