However, if you are using an iPhone 7 or earlier, you will find that this new button combination is more complex than before. Apple went into DFU mode, using the same button combination found in the iPhone 8, 8 Plus, and X. Your iPhone may be new, but the hidden DFU code isn’t. The process of putting these phones in DFU mode and restarting them is also a bit different from older iPhones with a physical Home button. Recovery and DFU modes can come in handy if you’ve fiddled with your iPhone and stopped loading completely for some reason. However, if you need something more powerful for your iOS device, DFU can be a powerful tool. Sometimes iPhone hiccups often require a simple reboot or restart.
Instead, it is usually the last resort to return your broken or faulty iPhone. If not running, DFU stands for Device Firmware Update.
