How to Downgrade from iOS 18 to iOS 17

Put your iPhone into Recovery Mode:
- Turn off your iPhone.
- Connect your iPhone to your Mac or Windows PC while holding the Power/Side button.
- Continue holding the button until the Apple logo appears.
- Release the button when you see a black screen with a cable and an arrow pointing to a laptop.
Restore iPhone from iOS 18 Beta to iOS 17:
- Open Finder on your Mac or the Apple Devices/iTunes app on your Windows PC.
- Select your iPhone from the left sidebar.
- When prompted with a dialog box, choose "Restore."
- In the next window, click "Restore and Update."
- Follow the on-screen instructions.
- Wait patiently for the downgrading process to complete.