Boot your iPhone 13 into DFU Mode

Step 1. Connect your iPhone to computer with a USB cable.

Step 2. Press the Volume Up button and release. Now press the Volume Down button and release. Then press the side button for 10 seconds (your iPhone’s screen will go black).

Step 3. While keeping the Side button pressed also press the Volume Down button for 5 seconds.

Step 4. Let go of the Side button while keeping the Volume Down button pressed for 10 more seconds. During this time your iPhone’s display will remain black.

Step 5. Now connect your iPhone 13 to your computer. You should see the message “iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes.”.

At this point you should be able to restore iOS on your iPhone 13.