4 OWL OS microSD Card Imaging
After connecting the 64GB+ microSD card to your computer, do the following:
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Download the latest OS image (file ending in .img) from Releases.
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Download, install, and run the Raspberry Pi Imager (download). Select Raspberry Pi 5 as the device.
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On the "Choose operating system" menu, scroll to the bottom and select "Use custom". Select the .img file you downloaded. Do not select any custom options (username, Wi-Fi, etc.), as they will not be written regardless.
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Select the microSD card and hit "next", then "write" on the next menu, then confirm.