DFU (Device Firmware Update) mode is a state that allows you to update the firmware on your iPhone.It’s sometimes necessary to put an iPhone into DFU mode when you want to update the firmware on your device or restore from a backup.
How to Put iPhone in DFU Mode?(Cover all iPhone)
For iPhone 8 and newer models:
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Connect your iPhone 8 or later to your Mac or PC and launch iTunes.
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Simultaneously press and hold the 'Power' and 'Volume Down' buttons for 3 seconds.
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Release the 'Power' button but keep pressing the 'Volume Down' button for approximately 5 seconds. If the screen remains dark, your iPhone should now be in DFU mode.
For iPhone 7 and 7 Plus:
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Plug your iPhone into your computer and launch iTunes.
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Press and hold the 'Power' and 'Volume Down' buttons simultaneously for a few seconds. Release the 'Power' key while continuing to hold 'Volume Down'.
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If the display remains dark, your iPhone 7 should now be in DFU mode.
For iPhone 6s and older models:
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Connect your iPhone to your computer and launch iTunes.
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Simultaneously press and hold the 'Home' and 'Power' buttons for approximately 10 seconds. Release the 'Power' key and keep holding the 'Home' key.
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Release the Home Button or volume down button. The screen of your iPhone will be totally dark if you have successfully entered DFU mode.