DFU stands for Device Firmware Update
DFU mode allows you to customize and select the firmware you want to install on your iPhone. If you want to install an older version of iOS, jailbreak your iPhone, or unlock your SIM, for example, you'd need DFU mode.
Using iPhone DFU Mode, you can:
- To downgrade the iOS version installed on the device.
- To jailbreak or unjailbreak the device.
- To uninstall an iOS beta version that has expired.
- To troubleshoot an iPhone that won't boot past the Apple logo.
Although putting the device into DFU Mode may be necessary to resolve some issues, it's crucial to keep in mind that it's possibly dangerous. It is possible to harm a device by using DFU Mode to downgrade the OS or jailbreak it.
