Check out great instructions with install script here: https://github.com/pimox/pimox7
Things to know before you begin:
1. PI 4 needs to have the bootloader updated to look for USB drive before defaulting to SD Card
2. You will not use an SD card, you will need an SSD with a USB cable.
3. Load the Raspberry PI OS (Legacy, 64Bit) Lite (NEEDS TO BE Debian Bullseye OS, will not work with the newer OS I tried….)
Now you can follow the instructions in the link above. Start at the SUDO step.
A good video you can follow is here: https://youtu.be/D6DIslXyIHU?si=Bati4NoHJV1vIKS0
