The so-called jailbreak of iOS system is the act of obtaining the highest authority of the system. The iOS system itself will not change qualitatively before and after jailbreak, but it can be fully utilized after jailbreak. After jailbreaking, it is more operational. If you get the highest authority of the mobile phone, you can modify the content of the mobile phone, including installing free cracking software, customizing functions, beautifying and so on. After jailbreaking, you can bypass the APPStore to download the App for free and freely install all kinds of software outside the App Store. Of course, jailbreaking also has disadvantages, such as losing the warranty after jailbreaking. After jailbreaking, background programs and desktop themes will increase power consumption. Jailbreak is to break the closure of the iOS system, so the mobile phone is relatively unsafe.

Second, brush machine:

Updating the phone refers to simply restoring, upgrading and downgrading the firmware (system), and upgrading the system refers to upgrading the system firmware to a newer version than the mobile phone firmware to use more optimized operations.