Raspberry Compute Module Install
less than a minute
this procedure was tested on a SEEED Studion mini router that uses a Raspberry-Pi4 Compute Module. These are the steps to follow to get the MCX-RTOS image onto the internal storage of a RPi:
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Put the RPi into USB Boot mode by setting the appropriate jumper on the RPi main board. 
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Connect the RPi4 to your computer with a USB cable so it is powered and you have USB access at the same time. 
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Download and compile the usbboot utility here: (https://github.com/raspberrypi/usbboot)[https://github.com/raspberrypi/usbboot]. 
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Run the command sudo ./rpibootto make the internal storage of the RPi visible.
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Use the Disk Image writer in Ubuntu Linux or the Raspberry Pi Imager utility to write the MCX-RTOS image to the RPi. 
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Unplug the RPi from the USB (power it off). 
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Remove the jumper. 
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Boot the RPi normally.