Installing the Latest Version of MicroPython
If Thonny fails to install (or you are using another application like Visual Studio Code to work with the Pico), perform the following steps:
Get the latest firmware release from MicroPython.org
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Download the latest uf2 to your computer (Nightly builds have the latest code, but may not be stable)
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Hold down the boot button on the board (white button)
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Plug one end of the USB cable into the board and the other end into your computer
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The Pico should show up as a new drive (labeled RPI-RP2) available on your computer
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Copy the downloaded uf2 file onto the RPI-RP2 drive
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The Pico should reboot and be ready to use.
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The RPI-RP2 drive will no longer be visiable on your computer.