Firmware or software repair is often used during phone repair. When answering the question of how to reinstall the iOS, it is first of all important to understand in which cases reinstallation is required, and when it is better not to do this.
Typically, the operating system is reinstalled in the following cases:
Teachers of bgacenter recommend to reinstall iOS on client phones or tablets exclusively during repair.
IOS reinstallation on the serviceable client device is carried out only with coordination of all risks with the client!
If you have previously replaced the NAND Flash chip on this phone to repair or increase memory, it is likely that the Wi-Fi and Bluetooth MAC addresses are incorrect. During the iOS reinstallation process the phone may not be able to go through activation and will die.
If the phone is disassembled, it makes sense to examine the board under a microscope. It is important for us to see the presence or absence of compounds around the chips: NAND Flash and MODEM. Perform the iOS reinstallation exclusively through the cable. From experience, when reinstalling the iOS “over the air ” via Wi-Fi, various bugs may occur.
For the firmware reinstallation of devices based on iOS, two programs can be recommended: this is the official iTunes and the Chinese analogue of iTunes, free software 3uTools.
iTunes can be downloaded from the official Apple website at this link
In our opinion, 3uTools is the most optimal program. This software can be downloaded on the developer’s website at this link.
This program has a wide range of features. We will describe how to use 3uTools in more detail in the following articles.
What needs to be done before the reinstalling iOS:
Files of downloaded firmware via iTunes are stored in the following folders:
Recovery mode is designed to restore the working state of the iOS device in the case of software failures. This mode is used when the iPhone or iPad does not boot in normal mode (the display and pressing the buttons do not respond).
In order to learn how to flash the iPhone, it is enough to read this article and answer the control questions (for students of the program: Modular and software repair).
When performing software repair of the device with the iOS operating system, you should follow the checklist above.
Correctly reinstall the operating system on phones and tablets, so that they do not die, and what to do if this happens, we study in detail during the training on diagnosis and BGA soldering.