How do you enter DFU mode on an iPhone 4?
I experienced a problem updating my iPhone 4 using iTunes. I had the same problem in the past with a 3GS, and was able to correct it by entering DFU mode (which I remember because I thought it meant Don't Mess Up, or something along those lines). What I don't recall is how you do it. Anyone know how to enter DFU mode?
Answers
It's actually called Device Firmware Update. Here is a step by step guide. It should be the same on the iPhone 4 as other iPhones.
http://thebigboss.org/guides-iphone-ipod-ipad/dfu-mode
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Step 1: Turn off your iPod touch / iPhone completely and connect to PC / mac
Step 2: Hold down the Power button for 3 seconds
Step 3: Without releasing the power button, also hold the Home button for 10 seconds
Step 4: Without releasing the home button, release the power button and keep holding the Home button for 20 seconds.
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Now follow the steps in the window to begin entering the DFU mode.
- Step 1. Hold your device, then click the green “Start” button;
- Step 2. After clicking the “Start” button, press the “Power” and the “Home” at the same time immediately for exact 10 seconds. The program will count the time for you.
- Step 3. When the 10 seconds passed, release the “Power” button right now, but keep pressing the “Home” for another 10 seconds.
- Step 4. You’ll be informed that you’ve successfully entered the scanning mode of the device after another 10 seconds, and you can release the “Home” button then.
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DFU Mode
http://theiphonewiki.com/wiki/DFU_Mode
"Entering DFU Mode (Official Instructions)
Plug your device into your computer.
Turn off the device.
Hold the Power button for 3 seconds
Hold the Home button without releasing the Power button for 10 seconds
Release the Power Button but keep holding the Home button
Keep holding the Home button until you are alerted by iTunes saying that it has detected a device in Recovery Mode
Make sure the device screen is blank and no logos are present"