CP=Codeplug
From previous post by LakeofFire:
The codeplug is basically the software in your phone. You can obtain the codeplug from your phone with a program called Super Agent RSS or Carrier RSS. You will hook your phone to your computer the same as you would to download rigntones to it, but instead you open the Carrier program and select to Read Phone. Once it has read gthe phone you can save your Codeplug and give it to whomever is asking for it. To reinstall it is much the same. Open the Carrier program load your new codeplug, hook your phone to your computer and select Write Phone. After it is complete your phone will restart itself and you are done.