How to Put iPhone into DFU Mode with Redsn0w: Timing Guide & Troubleshooting
Device Firmware Upgrade (DFU) mode is a specialized low-level hardware state built into Apple's bootrom. Unlike standard Recovery Mode, DFU mode bypasses the iBoot stage completely, allowing utilities like Redsn0w to inject custom payloads, execute the limera1n exploit, and restore custom signed IPSWs.
DFU Mode vs. Recovery Mode: The Crucial Difference
| Feature | Recovery Mode | DFU Mode (Required by Redsn0w) |
|---|---|---|
| Screen Appearance | Displays an "iTunes logo + USB cable" graphic | Completely black (looks turned off) |
| Boot Stage | iBoot stage active (Apple signature checks enforced) | SecureROM / Bootrom stage (exploitable by Redsn0w) |
| Custom IPSW Restore | Fails with iTunes Error 1600 / 1601 | Succeeds when in Pwned DFU state |
The Exact Second-by-Second Button Timing
Redsn0w provides an interactive countdown, but understanding the precise rhythm guarantees success on your first attempt:
- Turn Off the Device Completely: Connect the 30-pin cable to your computer. Hold the Power button and slide to shut down. Wait until all screen backlights turn completely off.
- Phase 1 — Hold Power (3 Seconds): Press and hold the top Power (Sleep/Wake) button firmly for 3 seconds.
- Phase 2 — Hold Power + Home (10 Seconds): Without releasing the Power button, immediately press and hold the front circular Home button simultaneously. Count to 10 slowly.
- Phase 3 — Release Power, Hold Home (15 Seconds): Release the top Power button immediately, but continue holding down the Home button firmly. Within 10 to 15 seconds, Redsn0w will identify the device in DFU mode.
What is Pwned DFU Mode and How to Enter It?
When downgrading or restoring custom firmware created by Redsn0w, standard DFU mode is not enough. You must put the device into Pwned DFU Mode to disable iTunes signature verification:
- Open Redsn0w on your PC or Mac.
- Click Extras on the main menu.
- Click Pwned DFU.
- Follow the on-screen button prompts. Redsn0w will inject the bootrom exploit and notify you: "You are now in pwned DFU mode. You can now launch iTunes and restore custom firmware."
How to Exit DFU Mode (Hard Reset)
If you entered DFU mode by accident or your screen remains black and unresponsive, you can safely exit DFU mode back to normal iOS without losing data:
- Disconnect the USB cable from the computer.
- Simultaneously hold down both the Power button and the Home button for 12 to 15 seconds.
- As soon as the white Apple logo appears on screen, release both buttons. Your device will boot back into normal iOS.
Next Step in Your Jailbreak:
Now that your device is recognized in DFU mode, proceed to the full jailbreak sequence: