DESPERATE! Please help flash Xperia Ion LT 28at ATT Unlockd Rooted


So I purchased an xperia Ion LTE 28at ATT UNLOCKED and ROOTED (The seller already rooted it)

I have never flashed a smartphone before but I'm very good with computers. Can anybody give me a guide or steps on how I can flash my phone from ICS to JB (Doesn't matter which version)

Thank You So Much!

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