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This article will explain in detail what mode dfu refers to. Xiaobian thinks it is quite practical, so share it with you for reference. I hope you can gain something after reading this article.

dfu mode is the forced upgrade and downgrade mode of iPhone firmware, which actually means the forced upgrade and downgrade mode of iPhone firmware. It usually appears when iPhone fails to boot, jailbreak fails, and self-made firmware degrades.

DFU stands for 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 (downgrade can only brush the homemade firmware).

It usually appears when iPhone fails to boot, jailbreak fails, and homemade firmware degrades.

You may have heard of iPhone DFU mode, the full name of DFU is Device Firmware Upgrade, which actually means forced upgrade mode of iPhone firmware. It's usually used when the iPhone won't boot, iTunes won't recognize it, or when jailbreaking boot is downgraded.

Note the difference from recovery mode: iOS devices in recovery mode will display iTunes +USB screen (different iOS versions may have slightly different patterns); DFU mode can only be detected by connecting to the computer and using software.

Method 1: Enter DFU mode when booting

Connect your device to your computer with a USB cable and you will hear a sound indicating that your computer is connected.

Please turn off your device first, and then you will hear a notification that your computer is not connected successfully.

Press and hold the Power button to display the Apple Logo, press and hold the Switch button and the Home button at the same time until the logo disappears, continue to press and hold the Power button for about 4-5 seconds, and continue to press and hold the Home button until iTunes detects an iPhone in recovery mode (if successful, the iPhone should be in black state). If detected with Redsn0w, the device model will be displayed at the bottom of the interface as DFU.

Method 2: Enter DFU in any state (white apple or infinite restart)

Connect the device to the computer.

Press and hold the switch button and home button directly until the logo disappears. Press the above steps to operate.

Method 3: Do not press the key to enter DFU (recommended for equipment with damaged keys)

Download the firmware for the device corresponding to the latest system version (you cannot use firmware that Apple has turned off for verification, and you can only use homemade firmware for those that are turned off).

Download Redsn 0w and go to Extra -Even More-DFU IPSW

Redsn0w will prompt you that this is an operation to make DFU firmware, not a normal recovery system operation. Choose yes.

After selecting the latest official firmware Redsn0w will start making DFU firmware and wait for it to finish.

Open iTunes Close Redsn0w, shift+ restore (Mac please use Option+ restore) Select the newly made DFU firmware (prefix ENTER_DFU), wait for error 37 to appear during recovery. The device is already in DFU mode.

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