But this would come to light quickly and mean that nobody installs updates any longer. I wouldn't. It would erode trust in software companies very quickly makin

But this would come to light quickly and mean that nobody installs updates any longer. I wouldn't. It would erode trust in software companies very quickly making everybody less safe. Furthermore, for the case cited, this wouldn't help. For that you'd need a backdoor for at least installing software without being the device owner. With that, you'll be mugged for your iPhone again.