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To use the default serial console available on pin 8 and 10 (GPIO 14 and 15) you have to use a USB to TTL serial adapter. How to connect it and how do configure the RasPi to get the serial console working you can look at What is the correct way to connect serial console on RPi4 Model B?.


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Use sudo ./install.sh --compact-kernel for the install command, like the error suggests you do. An sudo apt install build-essential may be an idea to ensure you have all the pieces installed and checking that the kernel-headers-5.10.11-v71+ however it is named for your running kernel is installed or it will never build.


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You obviously ignored the warning not to use rpi-update. Did you reboot? This is necessary to update kernel/firmware (which is why unattended-upgrades is pointless). sudo apt update; sudo apt install --reinstall libraspberrypi0 libraspberrypi-{bin,dev,doc} raspberrypi-bootloader raspberrypi-kernel will put it back to the latest supported kernel/bootcode. See ...


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