==User Manual==
* '''How to installing the Operating System (CM4 without eMMC)?''': Refer to [https://www.raspberrypi.com/documentation/computers/getting-started.html#installing-the-operating-system Official installation tutorial]
* '''How to flash OS onto the eMMC of CM4? (CM4 with eMMC)?'''
1. Short OTG Pin, refer to the picture below.