Why won't my iPhone 4G upgrade?

I have a iPhone 4.It upgraded the iOS 5.1 but will not upgrade to the iOS 6. I have no idea why. It will start downloading get half way done (taking 3 hours) then will say error & start all over again. Can anyone help me with this? It is jail broken… Do I need to restore it to get the upgrade or what? I have searched on the internet & can't find an answer

Try deleting some apps.

Try a restore. Had no problem with mine.

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