Downgrade from Kitkat to jellybean or lower versions for my Sony Xperia U ?

Hi all, I have Sony Xperia U, I upgraded its android version with Kitkat 4.4.4 but my mobile working too slowly and I'm facing lots of problems. So I want to downgrade it to Jellybean or lower version. So please guide me how to do this for my devise in detail. Thanks in advance...

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