Last verified: {{VERIFY: DD Month 2026}}

DFU (Device Firmware Update) mode is the lowest-level restore state on an iPhone — it loads before iOS, before the boot logo, and lets Finder or Apple Devices install firmware even if the device won’t boot normally. On iPhone 17, iPhone 17 Pro, and iPhone 17 Pro Max, and on iPhone Air, the sequence uses the same button combination as recent Face ID models but the timing matters: get it wrong and you’ll land in Recovery Mode instead, which is not the same thing. The steps below take about 30 seconds once you know the timing.

Before you start

• Back up first if the device still responds normally. Use Apple’s official backup guide — DFU restores typically erase the device.
• Turn off Find My (Settings → [your name] → Find My → Find My iPhone) before starting, if the device is accessible. Otherwise you’ll need your Apple ID password to complete the restore afterward.
• Cable and computer. A genuine or MFi-certified USB-C cable and a Mac or Windows PC with the latest Finder, Apple Devices app, or iTunes installed.

How to enter DFU mode

On Mac (Finder)

1. Connect your iPhone 17 or iPhone Air to your Mac and open Finder.
2. Press and quickly release Volume Up.
3. Press and quickly release Volume Down.
4. Press and hold the Side button until the screen goes black, then continue holding.
5. While still holding the Side button, also hold Volume Down for 5 seconds.
6. Release Volume Down but keep holding the Side button for another 5 seconds.
7. The screen should stay completely black with no logo, no text, and Finder should detect a device in recovery/DFU mode. If you see the Apple logo, you held too long — start over.

On Windows (Apple Devices app or iTunes)

1. Connect your iPhone to your Windows PC and open the Apple Devices app (or iTunes on older systems).
2. Follow the same button sequence as above: quick Volume Up, quick Volume Down, then hold Side button.
3. Hold Side + Volume Down together for 5 seconds, then release Volume Down only and continue holding Side for 5 more seconds.
4. Apple Devices/iTunes will show a message that it has detected a device in recovery mode — the screen itself stays black in true DFU mode.

If it doesn’t work

• Screen shows the Apple logo. You held the Side button too long and entered Recovery Mode, not DFU. Restart the device and try again, releasing more precisely on the timing.
• Finder or Apple Devices doesn’t detect anything. Try a different cable and a USB port directly on the computer, not a hub. See the restore error code index if you get a numbered error once detection happens.
• Screen shows “connect to computer” instead of staying black. That’s Recovery Mode, not DFU — still usable for a standard restore, but not what these steps are targeting. Restart and retry if you specifically need DFU.
• Buttons don’t respond at all. Confirm you’re using the physical Volume Up/Down and Side buttons, not on-screen equivalents — DFU entry requires the physical buttons.
• Device keeps rebooting during the hold sequence. This can indicate a hardware issue; if it persists across multiple attempts and cables, consider an Apple Store diagnosis.

Frequently asked questions

What’s the difference between DFU mode and Recovery Mode?

Recovery Mode shows the “connect to computer” screen and boots enough of the device to display it; DFU mode loads nothing at all and the screen stays completely black. DFU is the deeper state and is used when Recovery Mode restores fail or aren’t sufficient.

Will entering DFU mode erase my iPhone?

Entering DFU mode itself does not erase anything — it’s just a device state. Data loss only happens if you proceed to a Restore (not Update) once connected to Finder or Apple Devices.

Does this sequence work the same on iPhone 16 and older models?

The button sequence is similar for other Face ID iPhones, but the exact timing and combination differs on Home Button models. See iPhone 16 and iPhone 15 DFU mode for those steps.

My screen went black but nothing shows in Finder — is that normal?

Yes — a fully black screen with no logo is the correct DFU state. Finder or Apple Devices should still detect the device even though the iPhone’s own screen shows nothing.

Can I use DFU mode to install an older iOS version?

Only if Apple is still signing that version. DFU mode itself doesn’t bypass signing checks — see what IPSW signing means for how that restriction works.

Why does Apple recommend DFU mode over Recovery Mode sometimes?

DFU mode loads at a lower level than Recovery Mode, so it can succeed in cases where a device is too damaged or corrupted to boot far enough for Recovery Mode to work.

This site is not affiliated with, endorsed by, or sponsored by Apple Inc. All firmware download links resolve to Apple’s official servers — we do not host, mirror, or distribute firmware files.