I gotta say I am a little shy to try updating calibrations in the envoy yet. Maybe I will try tomorrow.
I am of the mindset of if there is not a specific reason or need to update a module I will not do so.
I did update a junkyard 2003 TrailBlazer PCM ($15) on the benchtop just to become familiar with the process as well as snoop the class 2 data bus during the event for curiosity.