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List of contents in this article:

• 1,Global trade barrier analysis How to reinstall the Apple 4s system
• 2, What is the system version of iPhone4S?
• 3, How to restore the system of iphone4s.
• 4, Apple 4s original ios7.1.2 system, how to downgrade back after upgrading to ios8 system?

How to reinstall the Apple 4s system

1, 2 enter Recovery Chinese restart the mobile phone restart to system two. Recovery mode refers to a mode that can modify the internal data or system. In this mode, you can flash into a new mobile phone system, or back up or upgrade the existing system, or restore the factory settings here.

2. Method 1: Directly upgrade 1 through the OTA of the iOS device. This method is only applicable to devices with iOS firmware version 0 or above and has not been jailbroken.

3. Download the latest version of iTunes on the computer, otherwise unknown errors may occur when reinstalling.

4. First, prepare to install the latest version of iTunes software on your computer, and then search on Baidu. Then connect the iPhone to the computer, wait for the iTunes software to recognize the iPhone, click the iPhone icon in the iTunes software, back up the data in the phone first, and click the "Backup Now" button.

5. OK. Flashing, a technical term for mobile phones, refers to changing or replacing some languages, pictures, ringtones, software or operating systems that originally existed in the mobile phone by a certain method. Generally speaking, flashing the phone is to reinstall the system on the mobile phone. Flashing can make the function of the mobile phone more perfect and restore the mobile phone to its original state.

6. Turn off the iPad and connect it to the computer USB, and open iTunes. Press and hold the POWER key and the HOME key at the same time. When you see the white Apple logo, release the POWER key and continue to hold down the HOME key.

What is the system version that comes with iPhone4S?.

The original system of Apple 4s is ios iPhone 4S is a touch-screen smartphone launched by Apple, the fifth-generation iPhone product.

The system of iphone4 and iphone4S is the same, but the version of the pre-installed system is different. iPhone4 is equipped with ios4; iphone4S is equipped with IOS5 iPhone, which is a smartphone series developed by Apple. It Equipped with the iOS mobile phone operating system developed by Apple.

The factory version of the system is different at different times. When it first came out, it was the 0 system, later it was the 1 system, and then it was 1. After ios6 came out, almost all 4S became ios6 when they got it.(I) What is iOS? iOS is a mobile operating system developed by Apple.

For Apple 4s, the highest version it can support is iOS5. Although this is a historical system, it can still meet some basic needs in daily use. In a word, the first version of the operating system adopted by Apple 4s is iOS5, and users can upgrade and choose according to their own needs and device conditions.

Since its release, 25 million iPads have been sold in 14 months. More importantly, the iOS 5 mobile operating system is here, and the new IOS5 system has 200 new features. In the early morning of October 13, 2011, Beijing time, Apple's mobile operating system iOS 5 was officially launched worldwide.

How to restore the system of iphone4s.

1. Open Design, Settings, General, Restore, choose to erase all content and settings, wait a few minutes, and the mobile phone will be automatically restored. Restore through iTunes. Connect to iTunes. After the mobile phone icon appears on the left side of iTunes, click it, and then select Restore. This needs to wait for the download. Download the ios installation package to restore.

2. Step 1: Download a reliable flash program. You can download the flash program on Apple's official website or the third-party software center. It is not recommended to download it on an insecure website to avoid some malware and other security problems.

3. Apple is divided into two recovery modes, one is called DFU mode and the other is recovery mode.This tutorial introduces the method of iPhone 4s entering DFU mode and recovery mode. The full name of DFU is Development FirmwareUpgrade, which actually means the forced upgrade mode of iPhone firmware.

4. The specific steps are as follows: Step 1 Connect the mobile phone and the computer. When the mobile phone is shuted, use a data cable to connect the mobile phone to the computer. Step 2 Press the volume up and down key and the power key, then press the side volume up key, and then press the volume down key for a long time and press the volume down key plus the power button without let go.

Apple 4s original ios7.1.2 system, how to downgrade back after upgrading to ios8 system?

Connect the mobile phone to the computer; open iTunes; click "Restore" and wait for the mobile phone to respond automatically; you can achieve the purpose of downgrading the system. Method 2: DFU mode recovery.

Click General to open the mobile phone, click Settings, and then click "General". Click Restore iPhone to enter the general page, and click "Transfer or Restore iPhone". Click Erase Content and Settings to enter the transfer or restore iPhone page, and click "Erase All Content and Settings".

iPhone mobile phone IOS system adopts a recommended upgrade and mandatory maintenance of the latest upgrade strategy. Once upgraded, it cannot be downgraded.

Apple has upgraded the system and can be downgraded. Usually, Apple devices are promoted in the official version of the iOS system.It can be freely downgraded within a week to a month after it is released: you need to download the corresponding previous version of the firmware of the device, and then flash it through the DFU function of iTunes without the help of any third-party tools. Pay attention to backup data before upgrading.