DFU mode on iPad, iPhone or iPod is ‘Device Firmware Upgrade‘ or ‘Device Firmware Update‘ that bypasses the current iOS installation and allows user to upgrade or downgrade (only if you have stored SHSH blobs) iOS version on apple devices. To update iOS on Apple devices you need to bring the device into DFU state or recovery state. If you are getting errors trying to restore in iTunes, DFU mode is very likely for you. Here we will talk about the DFU state. In DFU state, Apple device shows a blank, dark screen.
In DFU mode Apple device can interface with iTunes but does not load its operating system or boot loader. Here are few reasons when you need to bring your device into DFU mode:
- To jailbreak your Apple device (iPhone, iPad)
- Perform a SIM unlock
- Fix it if it’s non-responsive
- Upgrade/downgrade the firmware (iOS)
This is how to bring iPod, iPad or iPhone in DFU mode.
- Connect your device to your Mac or PC.
- iTunes will be opened. If not, open iTunes.
- Select your iPhone, iPad or iPod from the list of devices in iTunes.
- Turn your device off by holding down the power button at the top of the device.
- Hold down the Power and Home buttons simultaneously for exactly 10 seconds.
- After that release the Power button but keep holding down Home button until iTunes generates a message informing you that an iPhone in recovery mode has been detected.
If you are having problems then here is the same method in little bit more precise way:
- Connect your device into your computer and turn off the device.
- Hold the Power button for 3 seconds.
- Hold the Home button without releasing the Power button for 10 seconds.
- Release the Power Button but keep holding the Home button.
- Keep holding the Home button until you are alerted by iTunes saying that it has detected a device in Recovery Mode.
Timing is critical when putting a device into DFU mode. It may take a few attempts before you are successful in bringing device in DFU mode.
Connecting your device with computer and opening iTunes is not necessary. It is only to make sure that your device has been brought into DFU mode. You can bring your device into DFU mode without connecting it to computer and then after you have done so, connect it to computer and open the iTunes to verify that its in DFU mode or not.
In DFU mode, your device screen will be completely black. If you see Apple or iTunes icon or logo, this means that your device is not in DFU mode but in standard recovery mode.
Also Read How to Exit DFU Mode