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DFU stands for Device Firmware Update and is a mode commonly used to allow iOS to load on an unresponsive iPhone. Here we are going to use it to force a clean installation of iOS.
You’ll need access to a Mac or PC running iTunes to do this. You can’t do this directly from the iPhone.
To put your iPhone into DFU mode, you’ll need to press a few buttons that feel like sleight of hand tricks, and they’ll make you feel like you need an extra hand or two.
Too: How to Record Calls on Your iPhone (And Check If It’s Legal in Your State)
Follow the instructions carefully and take your time. It can be weird, and you might have to try a few times to get your iPhone into DFU mode and get it recognized by Mac or PC.
Once iPhone is in DFU mode and connected to Mac or PC, choose Update from the popup and follow the prompts.
If, while downloading the update, the iPhone exits the recovery mode screen, don’t panic! This can happen after 15 minutes of inactivity. Let the download complete on the computer then put the iPhone back into DFU mode and reconnect it.
