Which version of Opencv-python is compatible with Nano?

Opencv-python is not running on my nano, a simple import opencv-python throws illegal instruction, core dumped

This is most likely a build for x86 architecture, you need a arm64 build.

Look around here in the forum, there are a number of threads how to build and install OpenCV for Jetson, e.g. by this script: https://github.com/mdegans/nano_build_opencv

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got it, thank you!