This goes over the procedure to tune and unlock the ecm on your 2017-2023 L5P Duramax with HP Tuners.

HP Tuners VCM Suite BETA and net windows runtime 6 download (read notes below) https://www.hptuners.com/downloads/
***Underneath the VCM Suite BETA download you will see "Application Prerequisites: Net Desktop Runtime Windows x64" click that link and download it first, then download the VCM Suite BETA.

If you need credits you can simply purchase them online, just create an account with HP Tuners, add your mpvi3 device, then purchase credits for it. Once credits have been purchased just go into the vcm suite editor and select “resync interface” and they should be automatically applied to your device. See video below:

How To Add Credits To HP Tuners MPVI3 (MPVI2, 2+)
   • How To Add Credits To HP Tuners MPVI3...  

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