How to upgrade your xbox 360 to LT 3.0?

hey guys how are you all??? i want to upgrade my Xbox 360 LT 2.0 to LT 3.0... i have never ever done that before...i dont know how to do it and how to do it safely without causing any damage to my Xbox..please if any of you guide me from the very first step that how to do that...i will be very thankful to you guys...
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