How do I downgrade my iPhone iOS?

How do I downgrade my iPhone iOS?
How to Downgrade from iOS 16 or iPadOS 16

Launch Finder on your Mac.
Connect your ‌iPhone‌ or ‌iPad‌ to your Mac using a Lightning cable.
Put your device into recovery mode.
A dialog will pop up asking if you want to restore your device.
Wait while the restore process completes.

How to Downgrade from iOS 16 or iPadOS 16
  1. Launch Finder on your Mac.
  2. Connect your ‌iPhone‌ or ‌iPad‌ to your Mac using a Lightning cable.
  3. Put your device into recovery mode.
  4. A dialog will pop up asking if you want to restore your device.
  5. Wait while the restore process completes.