To restore your phone the way it used to be, it may be in some way to recognize the problem of your phone, and find out if there is a similar case and whether there is a solution like the case in your phone.
Or maybe with the last step is to refactory your phone, but here also need to be considered, do the refactory then all the data on your phone will be lost, so when the refactory process finished your phone like a new phone in the purchase with standard mode when the initial use .
I know this but to explain it to people who are my age or younger is um...frustrating. 30's in America....we all grew up with this tech one way or another. It's sort of like buying a car but not having the key mentality to me.
If they do not understand the term in the language of technology you should use a simple language or imagery that is easy to understand by them, may be an example that is slightly related to the problem of the phone.