DFU-mode: why is it needed, how to enter and remove the phone from DFU mode?
If you become the owner of a device running on iOS, you will immediately notice the difference in working with the same, for example, Android gadgets. Here everything is done at the same time simple and difficult. On the one hand, if you figure it out - all the processes really seem more understandable. On the other hand, it is sometimes difficult for a novice user to figure out how to properly synchronize a device with a computer; how media files are uploaded to the phone’s memory, how the system is restored.
One of the difficult for the new owners of "iPhone" is the term DFU-mode. About what he is, read in this article.
What is DFU?
So, these three incomprehensible (for now) letters are decoded as Defice Firmware Update, which translates as “firmware recovery mode”. In essence, this state is precisely such when the firmware is updated on the device — that is, the software for the activity of the entire system.
DFU mode on the iPhone can be entered by connecting to a computer and interacting with the phone itself. How to recognize it, how to control it, and what the state in general is - we will tell further.
Why do you need DFU mode?
First, of course, the natural question arises: why is it needed? We explain, because everything is extremely simple. Since software is a complex system that interacts with itself, there are situations when the shell of an electronic device “flies” for one reason or another. Perhaps the cause is an improperly installed component of a program, or a malicious application. In the end, all this or something like that can harm your phone.
DFU mode is the state of your iPhone when it is disconnected from the outer shell - a graphical expression through which you interact with the device in the usual way. You, in fact, do not see anything on the screen of your smartphone, and you can control the “iPhone” exclusively using a computer.
If, for example, a failure has occurred in the shell of your phone, correcting it by completely updating the firmware will help you with the DFU mode on the iPhone device.This is done at the touch of a button, but then your phone can function normally under a “clean” operating system. A pretty handy thing, if you think about it more deeply.
How to enter in DFU?
Now consider the procedure for introducing your phone in this state. As noted above, for this we need a connection to a PC and iTunes pre-installed on it.
To begin with we connect the smartphone with the computer and we take in hands our iPhone. On it you see two buttons - Home (central round, located at the bottom) and Power (key on the top of the smartphone). To operate the gadget, hold both of them for 10 seconds. After that, you must release the screen unlock key (Power), while not releasing the Home button. You should wait for another 5 seconds. You will see the Apple icon on a black background appeared on the screen of your “iPhone” on the black background - this is exactly the right sign that the phone has switched to DFU mode. Now he is ready to go.
On the computer screen you should see the corresponding changes. Read more about how to determine this state of the phone, later in the text.
How to determine the DFU mode?
So, to understand that the device is in such a state, you can only after connecting it with a computer. After connecting to the phone, iTunes will show that the iPhone has been found.Further, as soon as it is transferred to the DFU state, a message will appear on the screen with information about it. Following this, the user will be offered two options: update the firmware and restore the phone.
In the first case, a fresh version of the OS will be installed on the device; in the second, all user data is simply deleted, after which the “iPhone” will become clean, like a new one.
Again, these actions can be applied in different situations, depending on the needs of the user. For example, if your phone was locked with a password and you cannot remember it, recovery will help. If the firmware is completely gone, and you would like to update it, optimize its work, make it faster - you need an update, which is also available in this menu.
How to deduce from DFU?
In this article, we described what DFU is. They also outlined how to enter your device into the DFU mode, what can be done when the device is in it, and in what situations it should be done.
Go ahead - we describe how your “iPhone” can be taken out of the DFU mode in order to continue normal work with it further. After all, as you understandwithout a loaded shell, the phone is unable to function normally - it does not respond to keystrokes, completely ignores any commands on the touch screen.
So, the procedure for exiting such a regime, which is described in the article, is very similar to how an introduction to DFU takes place. To begin, the user must hold both Home and Power buttons for 10 seconds, then release the round "home" key, while continuing to hold Power. Very soon you will see how the phone rebooted and started working normally.