Try a DFU Restore:
Step 1: Connect your iPhone 11 to your Mac (or a PC with iTunes installed) with a Lightning to USB cable.
Step 2: Quickly press and release the Volume Up button.
Step 3: Quickly press and release the Volume Down button.
Step 4: Press and hold the Side button for 10 seconds until the iPhone’s display turns black.
Step 5: While continuing to hold the Side button, press and hold the Volume Down button for 5 seconds, and then release the Side button while you continue to hold the Volume Down button for an additional 10 seconds. If these steps are performed correctly, the display should remain black with no text or logos.
Step 6: Open iTunes on your Mac or PC, and you should see a message stating that “iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes.” You’ll then be presented with an option to restore iOS on your iPhone.
then on iTunes click Restore iPhone. It should work now.