Again, the DFU-mode is determined only by the presence of a completely black screen on the device. Instead, you start the standard recovery mode. Remember that if you see the iTunes logo,a prompt to restore or any message on the iPhone screen, you are not in DFU mode. When you enter DFU mode, the iPhone screen will be completely black.Įven though the screen becomes dark, it does not mean that the device can not be synchronized with iTunes or other service (for jailbreaking, etc.). Continue to hold Home until iTunes displays a message stating that your iPhone was in recovery mode. Press and hold the power button or Sleep simultaneously with Home for exactly 10 seconds, and then release the first one. Turn off the smartphone (hold the power button on the top of the mobile). For example, if you installed the iPhone OS of the new version, and then decided that you prefer the previous one, you need to reset the new installation using DFU mode.Ĭonnect your iPhone to your computer and start iTunes. This can happen for various reasons: the need to return the iPhone and its operating system to its previous state or use the custom firmware that is required for jailbreak or unlock SIM. The main reason why people needtransition to DFU mode on their mobile, is the need to change the firmware on the device. You can say that entering it means updating the firmware of the device. DFU mode is an option where you canEnable your iPhone in a configuration where it can interact with iTunes, but it will not boot up its operating system or bootloader (this is what really differentiates this mode from the recovery mode).
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