Have you tried everything to get your iPhone, iPad, or iPod to function again but have had no luck? DFU mode may be your last DIY choice if your device is stuck on a blank screen, the Apple logo, is misbehaving or appears to be bricked.

DFU (Device Firmware Update) allows you to communicate with your device through iTunes or Finder rather than loading the operating system directly from your device. As a result, DFU Mode enables all devices to be restored, even if iOS or iPadOS cannot start on the device.

That’s why before you take your phone to a phone repair in Montgomery, AL, DFU mode is a fantastic last resort for iPhones, iPads, and iPods that aren’t working or are malfunctioning.

But watch out!

When you use DFU mode, your device is entirely erased, which means you will lose all your data. You’re out of luck if you don’t have a backup from iCloud, iTunes, or Finder. You won’t be able to recover your data once you’ve entered DFU mode.

So, if you haven’t tried Recovery Mode yet, we recommend doing so before proceeding to DFU.

How to Perform a DFU Restore on Your iPhone, iPad, or iPod Touch

DFU for iPhone 8 Models and Above and iPad with No Home Button (use Face ID)

If you already exhausted all the steps repeatedly and it’s still not working, your iPhone will need to be physically repaired. Contact a trusted and reliable iPhone 7 repair in Montgomery AL to help you with your problem.

DFU for iPhone 7 and Below, iPod touch, and iPads with a Home Button

If you continue to experience problems after doing this, your iPhone will need to be physically fixed. To help you with your problem, contact a reputable and trustworthy iPhone 8 repair in Montgomery AL.

Reconnect your Backup to your Device

If DFU was successful, you could now restore your data by connecting to your iCloud or iTunes/Finder backup. But, of course, you can also start from scratch. It’s your decision!

Be Careful of DFU

Be careful that putting your phone into DFU mode can be dangerous. It’s quite likely that you’ll lose some or all of your data or that your key system files will be corrupted. You’ll probably void your smartphone warranty if you use DFU mode to downgrade iOS or jailbreak.


Q: How do we do buttonless DFU ?

A: We still use GPREGRET to notify the bootloader to enter DFU mode, but instead of using a soft reset, we go straight to the bootloader’s reset handle. We do this to take advantage of RAM sharing between the program and the bootloader. For example, suppose the device and the central are paired and bonded. In that case, we’ll use the SVC function DFU able svc set peer data to transmit bond information between the bootloader and the application via m peer data, which is contained in the noInit RAM space ().

Q: Why might bonding be a problem with DFU?

A: When your application is bonded to the central, both devices will attempt to encrypt the connection using the stored LTK every time the connection is made. On the other hand, the bootloader could not know where the program stores bond information, how to parse it, and so on. As a result, the connection between the central and the bootloader will be unable to be re-encrypted. The central device may terminate the connection (iOS devices do not do so, but Android devices do).

Q: I want my image to be signed, only authorized image can be accepted. Do you have any example ?

A: We have an experimental DFU with signing provided from SDK v9.0 at \examples\dfu\experimental. In that folder, you’ll find documentation and source code. Another example can be seen on Github.

Q: What is the best way to write the original application using a programmer (JLINK) rather than DFU?

A: It can be done in a variety of ways:

Q: What happens if something fails when doing DFU, would my device get bricked ?

A: There are several types of DFU:

Does DFU mode damage iPhone?

Although putting the device into DFU Mode may be necessary to resolve some issues, it’s crucial to consider that it’s possibly dangerous. Downgrading the OS or jailbreaking the device using DFU Mode can cause damage and void the warranty.

Note: If you intend to use DFU Mode, do so at your own risk; you are solely responsible for any negative outcomes.

Can I restore iPhone in DFU mode?

Putting your iPhone into DFU mode restores the device to its original factory settings. As a result, everything on the iPhone is deleted, including data and programs. Suppose you want to restore iPhone data after entering DFU mode. In that case, you can use professional iPhone data retrieval solutions like TunesKit iPhone Data Recovery, which can recover a wide range of data, including images, Wechat messages on iPhone, and more, and has a user-friendly interface.

What Happens if You Put your iPhone in DFU Mode?

The DFU mode on a Mac is analogous to the BIOS on a Windows computer or the Recovery Mode on a Windows machine. It’s “behind” the operating system — iOS —, but it can still communicate with iTunes or Finder on a Windows or Mac computer.

Your iOS device is more privileged access to iTunes or Finder when in DFU mode. This enables more customization than usual. Going into DFU mode, on the other hand, does not affect the iPhone or iPad.

DFU mode allows the device to connect to iTunes, update the firmware, and restore the operating system without automatically installing the most recent version downloaded. For example, it can be used to reinstall prior versions of iOS if beta is causing your phone to hang or if a jailbreak fails.

You should no longer have any software or firmware issues after restoring your iPhone in DFU mode. If it doesn’t work, try restoring your device, but don’t restore any data. If you do this and your iPhone still has issues, it will need to be physically repaired.

If everything else fails, take your phone and schedule an appointment to an apple iPhone repair in Montgomery like ours, Tech Repair Depot. We at Tech Repair guarantee fast phone repair, and we are proven to be trustworthy and use the best service for electronic repair in Montgomery. Contact us today!