RE: Can't Update Apps
One of my friends has recently experienced this particular issue, too! He didn't know what to do, and I couldn't do anything either beside telling him that he needed to flash it. He refused at the beginning, but he couldn't do anything else either, so he decided to lend me his phone. I successfully flashed it and installed CyanogenMod on it. Truth be said, it's the most seamlessly working UI, ever! For that moment on, the phone could properly update the apps and, ultimately, become a better phone in all of its aspects. If you haven't managed to fix this issue by any other means, then you must flash it. But you must seek professional assistance, as it could potentially brick your phone!