4s How to enter DFU mode? Iphone4s into the DFU mode step detailed

Phone4 Enter DFU mode step

1. Manually enter the DFU mode: The power-on state, with the data cable to connect with the computer well. Hold down the shutdown key for 2 seconds, then hold down the shutdown key and the home key for 8-10 seconds, and then hold down the home key for 15 seconds.

2. Check to enter DFU mode correctly: In DFU mode, the cell phone is black screen. If this is not successful, take the first step again.

3. After entering the DFU state, itunes checks to a restored iphone, you can see a Restore button, you hold down the keyboard Shift key, and then the left mouse button clicks "Restore". A window appears, the path to the firmware is found, and then double click on the firmware you downloaded. Finally, itunes will automatically recover. Remember, do not pull the data line in the process, do not move your iphone, as long as you wait quietly.

When the 4.iTunes recovery is complete, a window pops up, roughly "Your iphone has been restored, and this window will automatically close in 10 seconds." Close this window, then unplug the data cable, do not use the computer to activate the iphone, activating the system on the phone will be pure.

Add:

The first method: normal recovery

This recovery method is the most common way to restore the iphone firmware in a general unlock tutorial.

1. Connect the iphone to the computer and then turn the iphone off

2. Simultaneously hold down the switch machine key and the home key

3. When you see the white Apple logo, please release the switch button, and continue to hold down the home button.

4. Open itunes, waiting for its prompt you to restore mode, you can hold down the keyboard shift button, click "Restore", select the appropriate firmware to restore.

The second method: Black screen recovery

1. Connect the iphone to the computer with a USB cable, and then you will hear the sound of the computer connected successfully.

2. Now please turn off the iphone first, then you will hear the computer is not connected to the successful sound of the message.

3. Please hold down the switch machine key and the home button at the same time, continue to the first 10 seconds, please release the key immediately, and continue to hold down the home key.

4. itunes starts automatically at this time and prompts you for a recovery mode (the iphone will remain in a black screen state). Then you can hold down the SHIFT key on the keyboard and click "Restore" to select the appropriate firmware to recover.

Third method: Enter DFU mode without pressing any key (only implemented on Windows system)

1. Please download the first download

2. Find the file you just downloaded on your computer and unzip it, and then be sure to put it in the c:/dfu/directory

3. Connect your iphone to your computer, and if itunes pops up, turn it off.

4. So now you can run DFU this software.

5. Then enter "C:/dfu/dfu IBSS.m68ap.RELEASE.dfu", which does not include double quotes.

6. Please wait until the iphone appears screen status.

7. Now you can start to downgrade.

In summary, if you have a problem with your iphone or if it's broken, we can use the DFU mode to restore the operation. Oh, on top I have introduced the Bo will not be a demonstration of it.