What does dfu mode mean?

dfu mode refers to the forced upgrade and downgrade mode of the iPhone firmware. The iPhone has two special modes: one is the official recovery mode, with the iTunes logo and USB data cable displayed on the screen; the other is the "jailbreak" mode. "The DFU mode used is also called forced recovery mode. This mode does not display anything on the iPhone screen.

The operating environment of this article: iPhone6 ​​mobile phone, iOS12.4.1 system

The full name of DFU is Development FirmwareUpgrade, which means forced upgrade and downgrade of iPhone firmware model.

The iPhone has two special modes: one is the official recovery mode, with the iTunes logo and USB data cable displayed on the screen. The other is the DFU mode we use when jailbreaking, also called forced recovery mode. This mode does not display anything on the iPhone screen and is in a black screen state, so it has always been a difficulty in jailbreaking operations.

Enter method:

1. Turn off your iPhone.

2. Press and hold the power button and home button at the same time.

3. When you see the white Apple Logo, please release the power button and continue to hold the Home button.

4. Open iTunes, wait for it to prompt you to enter recovery mode, then hold down the Shift key on the keyboard, click "Restore", and select the corresponding firmware to restore.

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