Which backdoor do you mean? I'm not an Apple expert by any means, but I thought they encrypted customer data in a way that even they can't get to it? Wasn't that the crux of this case, that Apple couldn't help the FBI due to security measures, prompting the agency to ask for a backdoor?
IIRC the question is when the phone is totally locked, e.g. if you turn it off then turn it back on and haven't entered the PIN yet. In this state even apple can't get an update to run, the secure hardware won't do it unless you wipe the phone first. And your data is encrypted until you unlock the phone.
In practice though most people are screwed b/c it's all already in icloud.
