?? Lens adapter firmware... different brands compatibility ??

I've read that the internal electronics of various lens adapters come from one Chinese factory and are identical. Since the hardware and electronic contact points are 100 percent compatible, couldn't one brand of firmware work with any other brand of adapter? It seems the only difference between brands is firmware, so updating to the best firmware of any brand should work with any other 'budget priced' brand. Shouldn't it?