![]() ![]() ![]() To exit DFU mode, disconnect iPhone 4S from the computer, and then hold down a combination of the Home button and Power key until the APPLE logo appears. What is DFU Mode Used For?ĭevice Firmware Upgrade mode is intended to restore or upgrade the APPLE device.ĭFU mode can help fix problems that may appear while using the iPhone 4S by changing software version or wiping data. This mode is a non-removable part of the SecureROM. Firmware is the programming that controls the hardware of your iPhone 4S.ĭFU mode is a mode, where the BootROM accept iBSS. After that your iTunes should detect your iPhone in Recovery Mode.ĭevice Firmware Upgrade is a deeper and more advanced than the normal Recovery mode.Now release only Power button, but please hold on Home button for 10 seconds.Then press and hold 2 buttons: Home button + Power button for about 10 seconds.* Make sure that you have installed iTunes. Next, please connect to your laptop or PC.Also, you need a Mac or computer with the Windows OS, where iTunes will be installed, and the USB cable to be able to connect APPLE iPhone 4S with the PC.ĭevice Firmware Upgrade mode does not load the iOS system but gives possibility to link it with iTunes software. This mode works in tandem with the iTunes program. iPhone 4S DFU ModeĭFU mode gives a possibility to recover iPhone 4S, update system version and reset settings from any state. The simple tutorial of booting DFU Mode. Here you will see how to get access to iOS hidden mode and how to leave it. How to enter DFU Mode on APPLE iPhone 4S? How to exit DFU Mode on device? How to open Device Firmware Upgrade mode on APPLE device? How to run DFU mode correctly? ![]()
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