I think it’d be safer to do it on an earlier system then Pi4 8GB, but it might work doing it on 8GB itself.
If anyone is in a pinch and only has a Pi 4 8GB handy, I can confirm that it works and can even work for a headless install
Again If you have an earlier Pi available I recommend androidhead’s instructions, but these worked for me in a pinch
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Flash an SD card with Patchbox OS
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Put the SD card into RPi 8GB and turn it on
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Log in via ssh (I did so via wifi to the Patchbox hotspot)
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Follow the config script as usual. If you are on Patchbox, you will need to switch to a wifi network that has internet access to download updates, but do not reboot. If you do accidentally, go back to step-1 and re-flash the card.
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Once you have internet access, run
sudo apt install raspberrypi-kernel
sudo apt update
sudo apt upgrade -
If those install successfully, reboot your Pi and all should be good.