It used to be that if your iPhone or Galaxy was damaged, you were at the mercy of Apple or Samsung to get it fixed as manufacturers snowed customers with a blizzard of unattainable proprietary parts and software diagnostics. But that pain hasn't been limited to smartphones, and a legal movement challenging who controls the diagnostic and reprogramming tools for anything from phones to automobiles, dishwashers and farm equipment — all of which consumers say have become increasingly difficult to