After using the iPhone 6 for several months, it becomes difficult to open text messages, similar to a crash. What is the reason? How to fix it?

The iPhone clearly shows that the battery still has power, but after a while the phone suddenly shuts down automatically. Sometimes the problem is solved by pressing the Home button and the Power button at the same time for more than 10 seconds to enter the DFU mode and hard booting. However, after a period of time, the Apple phone automatically shuts down again. Even in DFU mode, some phones still have a black screen and no response. So what is the reason why Apple phones always shut down automatically, and how to solve it?

1. System firmware compatibility issues

Mobile phones are hardware, while system firmware is system software. System software is responsible for scheduling hardware operation and providing human-computer interaction with users. We know that Apple's iOS system is closed. Some people like to break the restrictions of the iOS system and jailbreak. They can download free cracked APP application software and application software banned by Apple. Since some functions of the iOS system firmware have been rewritten, affecting the compatibility of the original system firmware with the mobile phone hardware, there is a possibility that the jailbroken system firmware will cause the Apple phone to automatically shut down. The solution to this situation is to either re-flash the phone and jailbreak it, or flash Apple's official system firmware.

2. Application software plug-in compatibility issues

As mentioned above, Apple’s IOS system is closed. All APP applications running on the IOS system must be officially certified by Apple. Testing, only APP applications that pass the test can be downloaded, installed and used by other users in Apple’s APPstore. Apple prohibits the launch of some APP applications that affect the security of the Apple system or users. Jailbroken Apple phones can install these APP application software, such as interface beautification, address book management tools, text message management tools, file management tools and other APP application plug-ins. Since these plug-ins have not been rigorously tested by third parties, they may cause compatibility issues in the system and cause the Apple phone to automatically shut down. The solution to this situation is to uninstall the recently installed APP application plug-in.

3. Hardware problem: battery leakage

The iPhone charger has a voltage of 5V and a charging current of 1A, while the iPad charger has a voltage of 5V and a charging current of 2A. Long-term use Using an iPad charger to charge an iPhone will damage the iPhone's battery. If you use a non-original charger and the charging voltage and charging current are not strictly controlled, it will also damage the iPhone's battery. In this way, the battery durability of the iPhone will be relatively poor and the power will be consumed quickly. Even though it looks like it has power, The battery will be exhausted after a while. In this case, if you use DFU mode to start the phone, of course it will not start. You can only replace the battery of the Apple phone.

4. Hardware problem: motherboard power IC

The power IC is a logic control unit on the motherboard that is used to power Apple mobile phones. If there is a calculation error in the logic control unit, it means that the mobile phone battery is obviously charged, but the mainboard power IC layer thinks that the mobile phone battery is out of power and automatically shuts down the mobile phone. In this case, you can use DFU hard boot mode to restart the phone. When the mobile phone has been used for a period of time and the mainboard power IC makes a calculation error again, it will automatically shut down again. In a similar situation, if it is within the warranty period, you can find the official after-sales service to replace the whole machine for free. If the warranty period has passed, you can only find a repair station for repair.