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[https://en.wikipedia.org/wiki/Uuencoding The UU Encoding Wikipedia page] is a good resource for UU encoding. Python includes functions for decoding UU strings to binary in the binascii module. Documentation can be found [https://docs.python.org/2/library/binascii.html here]. Note that the bootloader uses a tilde ('`' ) for 0 instead of a space (' '), meaning you need to replace '`' the tildes with ' ' spaces in your UU Encoded string before decoding. Also note that the first character of a UU Encoded line is the length of the line. This needs to be at the start of the line when it is passed to the decoding function. For an example, see the script at the bottom of this page.