Hello guys. I am an iPhone 5 owner. My first iPhone was a 3GS (2009). I've used the same backup since 2009. iOS 8.3 runs great on my iPhone 5. I just notice it has worse battery life compared to iOS 6, but I guess that's sadly normal. I always read about clean installs (DFU restore setting the phone as new) to improve things. Would it improve my situation as well, even if I do not notice problems (but there may be...?)? And, what would I definitively loose? Messages? App data? Gallery metadata? It would be boring to download everything again... thanks.