Quite the opposite with me. I installed Stunlocker and purchased a license. I then changed the wheel circumference, but only to the exact measured wheel circumference of my bike. I also changed the market to US. At that time there were quite a few Shimano E8000 motors suffering with torque sensor faults (WO13) and my bike ended up being one of them.
I just un-installed the app took my bike to the dealer who fitted a new motor without question. That was two years and 2,600 miles ago. I did have to buy a new license but it was worth it as it transforms the riding experience.
i have a second E8000 powered bike, also Stunlockered and set to the US market, which I have done well over 2000 trouble free miles on.
I quite fancy a new bike but not being overly IT competent it is not clear to me if I could change the market/speed on the EP8 so I will stick with my current bikes (a Focus and a Canyon ) for the time being.
You can change the region on EP with the desktop version of STUnlocker - you just need the Shimano PC link - SM-PCE1.