iPhone 7 refusing to leave DFU mode

It's off to the Apple Store / Genius Bar or an authorized Apple service shop.

The diagnosis should be no charge, but the cost of a fix......if it is offered.....will be difficult to justify on a phone that is 3-4 generations behind on iOS versions.

You can find a list of authorized service shops in your area using this link:

Find Locations

Good luck

1. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)
2. Follow the Apple article to resolve the issue --> If your iPhone, iPad, or iPod touch won't turn on or is frozen ...
3. If not resolved; please follow the steps in the following link for support with this issue: If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly
4. You still see a black screen after charging, force restarting, following the steps in this article.
   1. You see a black screen, but you can hear alerts, sounds, and vibrations.
   2. The screen remains black, but the device chirps when you unmute it and connect it to power.
   3. Your screen is on, but it doesn't respond when you tap, slide, or try other gestures. 
   4. You can't force your device to restart because a button is broken or stuck.
   5. Your device is stuck on the Apple logo, displays a solid color, or isn't recognized in iTunes.
   6. Contact Apple Support to set up service if you have any of the above issues:
5. Please follow the steps in the following Apple Video for support with this issue:

It is finished, time for a newer phone.