You probably simply don't know what this is about. When Android phones "age" to a certain point, they become locked (user cannot log into the OS), and the only way to circumvent this is by jailbreaking them and installing a different firmware / OS.
I have a Galaxy S7 that is in this condition, and I haven't the time to try to reinstall it.
Many users never face this problem because they buy new phones before their old ones hit this particular point, often because many applications will stop working before that due to developers discontinuing support effectively rendering the phone useless. I ran into this problem because I kept my phone around due to some images stored on it (well, now that's lost forever).
I have a Galaxy S7 that is in this condition, and I haven't the time to try to reinstall it.
Many users never face this problem because they buy new phones before their old ones hit this particular point, often because many applications will stop working before that due to developers discontinuing support effectively rendering the phone useless. I ran into this problem because I kept my phone around due to some images stored on it (well, now that's lost forever).