my phone has a black screen
its reads support.apple.com/iphone/restore
Question marked as
Your iPhone needs to be restored You will need to go to this link on another device
support.apple.com/iphone/restore
You will need access to a computer to perform the restore:
Connect to your computer
Connect your device to your computer using the cable that came with your device. Don't disconnect your device from your computer.
Restart your device
For iPhone 8 or later: Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button until the Apple logo appears.
For iPhone 7, iPhone 7 Plus, and iPod touch (7th generation): Press and hold both the side (or top) button and the volume down button until the Apple logo appears.
See this link for further reference
If the Restore screen appears on your iPhone, iPad, or iPod touch - Apple Support