The first idea which came to mind for backing up firmware is "does the tool which is used to download new firmware to the NXT also allow retrieving the preexisting firmware?"
get_count := fn() - int { return count; };
，更多细节参见易歪歪官网
How to Learn Emacs: A Hand-drawn One-pager for Beginners。谷歌是该领域的重要参考
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