dfu mode is the forced upgrade and downgrade mode of iPhone firmware. It actually means the forced upgrade and downgrade mode of iPhone firmware. It usually appears when the iPhone cannot be turned on, the jailbreak fails, or the homemade firmware is downgraded.
#The operating environment of this article: Windows 7 system, Dell G3 computer. The full name of
DFUis Device Firmware Upgrade, which is the forced upgrade and downgrade mode of iPhone firmware. The actual meaning is the forced upgrade and downgrade mode of iPhone firmware (only self-made firmware can be downgraded).
It usually occurs when the iPhone cannot be turned on, the jailbreak fails, or the homemade firmware is downgraded.
Perhaps you have heard of the DFU mode of the iPhone. The full name of DFU is Device Firmware Upgrade, which actually means the forced upgrade and downgrade mode of the iPhone firmware. It is generally used when the iPhone cannot be turned on, cannot be recognized by iTunes, or when the jailbreak boot is downgraded.
Note the difference from recovery mode: the screen of the iOS device in recovery mode will display the iTunes USB screen (devices with different ios versions may have slightly different patterns); while DFU mode can only be detected by connecting to a computer and using software .
Method 1: Enter DFU mode when the computer is powered on
Connect the device to the computer with a USB cable, and then you will hear the computer is connected Success sound.
Please turn off the device first, and then you will hear the prompt sound that the computer has not connected successfully.
First press and hold the power button to display the Apple Logo, then press and hold the power button and home button at the same time until the logo disappears. Continue to hold the power button for about 4-5 seconds, release the Power button, and Continue to hold down the home button until iTunes detects an iPhone in recovery mode (if successful, the iPhone should be in a black screen state). If detected with Redsn0w, the device model will be displayed in DFU at the bottom of the interface.
MethodMethod 2: Enter DFU in any state (white apple or infinite restart)
Connect the device to the computer.
Directly press and hold the power button and home button until the logo disappears. Follow the above steps.
Method 3: Enter DFU without pressing a key (recommended for devices with damaged keys)
Download the latest system version corresponding The firmware of the device (firmware that Apple has turned off verification cannot be used, only self-made firmware can be used if it is turned off).
Download Redsn0w and enter Extra-Even More-DFU IPSW
At this time Redsn0w will prompt you that this is the operation of making DFU firmware. It is not a normal recovery system operation. Select Yes.
After selecting the latest official firmware, Redsn0w will start making DFU firmware and wait for completion.
Open iTunes and close Redsn0w, shift to restore (please use Option to restore on Mac), select the DFU firmware you just created (prefixed with the word ENTER_DFU), and wait for error 37 to appear during the restore process. At this time the device is already in DFU mode.
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