
how to put iPhone/iPad in DFU mode?
for iPhone 8/X/XR/XS:
1.Plug your iPhone X or iPhone 8 into your Mac or PC.
2.Make sure iTunes is running.
3.Turn Off your iPhone X or iPhone 8 (if it isn't already).
4.Press and hold down the On/Off button on the right side of your iPhone for 3 seconds.
5.Press and hold down the volume down button on the left side of your iPhone while still holding down the On/Off button.
6.Keep holding both buttons down for 10 seconds. (If you see the Apple logo, you've held them too long and will need to start again.)
7.Let go of the On/Off Button but keep holding the volume down button for about 5 seconds. (If you see the "Plug into iTunes" screen, then you've held it too long and will need to start again.)
8.If the screen stays black, that's it! Your iPhone should now be in DFU mode.
For iPhone 7/7 Plus:
1.Plug in your iPad or iPod touch to your Mac or Windows PC.
2.Make sure iTunes is running.
3.Turn Off your iPad or iPod touch if it isn't already.
3.1Press and hold down the On/Off button on the top of the device for 3 seconds.
3.2Swipe the slide to power off slider to the right.
4.Press and hold down the On/Off button on the top of your device for 3 seconds.
5.Press and hold down the Home button on the front of your device while still holding down the On/Off button.
6.Keep holding both buttons down for 10 seconds. (If you see the Apple logo, you've held them too long and will need to start again.)
7.Let go of the On/Off Button but keep holding the Home button for about 5 seconds. (If you see the "Plug into iTunes" screen, then you've held it too long and will need to start again.)
8.If the screen stays black, that's it! Your iPad or iPod touch should now be in DFU mode.
once you stuck on DFU mode, here can help you to get out of DFU mode
https://www.fonecope.com/iphone-stuck-on-loading-screen.html.