The iPhone has a service mode known as Device Firmware Update, or DFU, in which the phone can still communicate with a connected computer but will not attempt to load iOS. If you want to install an older version of iOS on your iPhone or you want to "jailbreak" the phone and install custom firmware, you can force the iPhone to enter DFU mode. While it might sound complicated, the procedure is simple and straightforward.
- Skill level:
- Moderately Easy
Things you need
- USB data cable
- iTunes software
Connect one end of your USB cable to the dock connector on your iPhone and connect the other end to your computer.
Open the iTunes application on your computer.
Hold down the "Power" button on your iPhone and slide the bar to turn off the phone.
Press the iPhone's "Power" and "Home" buttons at the same time. Hold both buttons down for 10 seconds.
Release the "Power" button but continue to hold the "Home" button until iTunes informs you that it has detected an iPhone in recovery mode .
Tips and warnings
- Jailbreaking your iPhone, while entirely legal, will void the manufacturer's warranty. Be aware of the risks involved before modifying your iPhone's firmware.
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