I was in the at&t store this morning to get a news case for my 8310. I asked the girl when they are going to put the 4.5 upgrade on their website. About 3 people answered at once and said just go to blackberry's website and dowlnload it from there. I asked if that would void the warranty and the response was no. We wouldnt tell you to do that if it would void the warranty. Has anyone else done this and did it go ok?