1. The switch go to slave
2. Connect USB to your computer by USB Adapter
3. Install and run the rpiboot, the computer recognizes the CM4 as a U disk, and then you can write an image to the CM4.
1. Put dt-blob.bin to /boot/
USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host at config.txt
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