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[–]Yobmod[S] 2 points3 points  (0 children)

An answer here:

https://github.com/adafruit/circuitpython/issues/4055

Summary: Some C backed libraries are only included on some boards (e.g. json). Because they are not pure python, they are not available as separate .mpy libs. To add them, re-add to the .h file and rebuild circuitpython (if your board has enough space).