You exchange your original pcm. Ship it to HP tuners and they send you back an unlocked one. They send you everything you need to do this. Make sure you have a windows os. I used parralels on my MacBook so I can boot the windows os anytime no need to restart the computer or buy a separate laptop.
cost is the same as on the hp tuners website for the exchange service on chevy pcms it’s included into the price for the procharger kit.