download-system-image
From Vivid Unit
Download OS Image
Vivid Unit comes with Debian operating system pre-installed, usually you don't need to install system by yourself.
However if you want to re-install the system, or want to install a different system (if available), you can download the system disk image here.
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debian-rk3399-vivid-unit-v13-20240118.img.xz (1.14 GB)
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You can find more details about how to install system here.