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==Installing the Operating System==
=== Flash OS onto the Micro SD card (CM4 '''without''' eMMC)===
Please refer to [https://www.raspberrypi.com/documentation/computers/getting-started.html#installing-the-operating-system Official installation tutorial]
=== Flash OS onto the NVME SSD===
You need to refer to the above steps to flash the OS into the Micro SD card, then insert the Micro SD card, turn on the device, and then click '''Applications''' =>'''Accessories''' =>'''SD Card Copier''', run the '''SD Card Copier''' program, and copy the OS to the NVME ssd as shown in the figure below.
[[File:Sd-copoer-scrot.png]]
Click '''Start''' to run. Then shut down, unplug the SD card, and restart the device.
=== Flash OS onto the eMMC of CM4 (CM4 with eMMC)?===
1. Short '''nBoot''' Pin, refer to the picture below
[[File:X635-nboot.png|700px]]
2. Connect Type-C OTG with a Type-A to Type-C cable to your computer
3. Power the device via PWR Type-C with your 5V Power adaper
4. Then rerfer to [https://www.jeffgeerling.com/blog/2020/how-flash-raspberry-pi-os-compute-module-4-emmc-usbboot this tutorial] to flash raspberry pi OS
5. Remove the jumper of '''nBoot''' after flashing is complete, then continue the following steps;
PS：If you use CM4 with eMMC, then SD card cannot be used.
==Preconfigure X635 Device for CM4==
Note: You should get back <big>supported=1, detected=1</big>, indicating that the CSI-2 bridge is detected and supported by the operating system. If you get detected=0, then the CSI-2 bridge is not being seen by the operating system.
==Test x635 shield via command line== ===Connect the HDMI in source device to x635 carrier board===Before testing the X635, you must connect your HDMI signal source device into [[X635]] as the HDMI in HDMI to CSI-2 bridge with mini HDMI to HDMI wire.connection sample diagram
<big>IMPORTANT! The HDMI to CSI-2 bridge only accepts HDMI input: 1080p30, 1080p25, 720p30, 720p25</big>
===Picture test===
Record a sample picture: open a terminal window and run the following command to take a still picture and save it to the Desktop: