:*Remove the nBOOT jumper after the flashing is complete, then restart your device.
'''Note''': For CM4 with eMMC, the SD card cannot be used.
#CM4 without eMMC (simpler, but you need a 32GB or 64GB micro sd)
:''' 1) 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]
:'''2) How to flash OS onto the eMMC of CM4? (CM4 with eMMC)'''
::a. Short nBOOT&GND, refer to the picture below.
::[[File:X650-IMG-5474-1.jpg|500px]]
::b. Connect Type-C OTG to your computer
::c. Power the X650 via PWR Type-C with your 5V Power adaper
::d. Then rerfer to [https://www.jeffgeerling.com/blog/2020/how-flash-raspberry-pi-os-compute-module-4-emmc-usbboot this tutorial] to flash pikvm OS
::e. Remove the jumper of nBOOT&GND after flashing is complete, then restart your device;
4. Power the device, then open explore to login the pikvm web ui.
===Enable RTC ===