Why won't my iPhone 4 update with the iOS 6?

Ok I jail broke my iPhone 4 like two weeks ago and I unjailbroke it lastnight because I thought that's why it wouldn't let me update it. But I've been trying, I have full battery life and full Wi-Fi connection and it refuses to update. I don't know why and it bothers me to the piont I'm about to switch to an android.

I wouldn't update to ios6.So many phones are having problems with it. Plus you will loose Google search engine, YouTube, and Google maps.

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