The ultimate solution to persistent iPhone problems is also the most drastic. It is about putting the iPhone in DFU mode, a state that we have to resort to when the rest of the options have failed. This is something that you have to take into account, as it is not simple and takes time, so it is not an easy solution to apply.

If you put your iPhone in DFU mode, you can get it back and restart it. Of course, you may lose data depending on whether you cannot access the device and its backup is not up to date. So please use this tool with caution. If you still have access to the iPhone, make a backup before putting it into DFU mode.

How to put an iPhone in DFU mode

Over the generations, putting the iPhone in DFU mode has changed. For this reason, be sure to apply the correct method for your iPhone model.

How to put an iPhone with Face ID into DFU mode

Connect your iPhone with wired Face ID to your Mac or PC. Open Finder or iTunes and leave them open. Turn off the iPhone if it is still on. For 3 seconds, press and hold the power button on the right side of the iPhone. Hold down the button, hold down the volume down button on the left side of the phone. Hold both buttons for 10 seconds. If at this point the Apple logo appears, you will have to start the whole process again. You can now release the right button by holding down the volume down button for an additional 5 seconds. Again, if you see the “Connect to iTunes or Finder” message on the screen, you missed a tap and need to start over. If the iPhone still has a black screen, you have done it.

Now your computer should have detected that the iPhone is in DFU mode and will allow you to restore it.

How to put an iPhone 8 or iPhone SE 2 in DFU mode

If you have an iPhone 8, iPhone 8 Plus, or iPhone SE 2, you can follow the same steps as an iPhone with Face ID to put it into DFU mode. Concretely, they are as follows:

Connect your iPhone 8 or iPhone SE 2 with a cable to your Mac or PC. Open Finder or iTunes and leave them open. Turn off the iPhone if it is still on. For 3 seconds, press and hold the power button on the right side of the iPhone. Hold down the button, hold down the volume down button on the left side of the phone. Hold both buttons for 10 seconds. If at this point the Apple logo appears, you will have to start the whole process again. You can now release the right button by holding down the volume down button for an additional 5 seconds. Again, if you see the “Connect to iTunes or Finder” message on the screen, you missed a tap and need to start over. If the iPhone still has a black screen, you have done it.

How to put an iPhone 7 in DFU mode

Again, the iPhone 7 and iPhone 7 Plus generation goes through small changes when it comes to putting them into DFU mode. The steps to follow are as follows:

Connect your iPhone 7 or iPhone 7 Plus with a cable to your Mac or PC. Open Finder or iTunes and leave them open. Turn off the iPhone if it is still on. For 3 seconds, press and hold the power button on the right side of the iPhone. While holding down the button, press and hold the circular home button on the front of the iPhone. Hold both buttons for 10 seconds. If at this point the Apple logo appears, you will have to start the whole process again. If the iPhone still has a black screen, you have done it.

How to put an iPhone 6s or earlier in DFU mode

The iPhone 6s and earlier versions have a physical home button, which is why again, the DFU mode on these iPhones works differently. Follow these steps to complete it:

Connect your iPhone 6s, iPhone 6s Plus or any previous model with a cable to your Mac or PC. Open Finder or iTunes and leave them open. Turn off the iPhone if it is still on. For 3 seconds, press and hold the power button on the right or above the iPhone. While holding down the button, press and hold the circular home button on the front of the iPhone. Hold both buttons for 10 seconds. If at this point the Apple logo appears, you will have to start the whole process again. Now you can release the power button, holding down the Home button for an additional 5 seconds. Again, if you see the “Connect to iTunes or Finder” message on the screen, you missed a tap and need to start over. If the iPhone still has a black screen, you have done it.

What can the DFU mode of an iPhone do?

If during the process of putting iPhone into DFU mode, you see some kind of logo, then you have actually put iPhone into recovery mode. Sometimes this can be enough, but it won’t always be the solution to some of the issues that may arise on iPhone. That is why if you were not successful, repeat the process until it is completed correctly.

IPhone DFU mode can be of use to us for what we have discussed, those situations where persistent device errors are not resolved. Those who tinker with their iPhones to jailbreak them will find in DFU mode a way to “unlock” their devices or put them back in the “fold” of Apple. It is also useful if we are in an expired beta version of the iPhone and want to use it again.

If you suspect that your iPhone has suffered liquid damage, then it is better not to put it in DFU mode as it may stay locked forever.

In general, putting iPhone in DFU mode is a tool of last resort if our iPhone has been infected with some kind of spyware like Pegasus. If you have already verified that your iPhone is affected by Pegasus, putting it in DFU mode will be the way to remove all traces of this spyware, since it requires jailbreaking to achieve its goals.

Finally, it should be noted that if your device has been damaged by water or you suspect that it may have water damage, it is best not to put your iPhone in DFU mode. Contact with liquids may have damaged some components that prevent iPhone from operating or exiting DFU mode.