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To use a prebuilt firmware, you can just use uflash, tested on Ubuntu 22.04:
git clone
cd micropython
git checkout 7fc33d13b31a915cbe90dc5d515c6337b5fa1660
uflash examples/
What that does is:
  • convert the MicroPython code to bytecode
  • join it up with a prebuilt firmware that ships with uflash which contains the MicroPython interpreter
  • flashes that
To build your own firmware see: