Print the COS Tutorial ... read it several times ... and make some notes about the necessary steps. It is actually very straight forward.
Do you have a 2 bar (or 3 bar) MAP sensor fitted ? The stock 5.3L 1 bar MAP is useless under boost conditions.
If you are using EFILive for this project, you may want to consider posting on their Forum to get support with respect to the COS upgrade.
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