Diff two firmware versions

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bbbb uu uu rrrrrr kk k aa b b uu uu rr rr kk k aa b b uu uu rr rr kk k a a bbbbb uu uu rr rr kkk aaaaaa b b uu uu rrrr kk k aa aa b b uuuuuuuuuuuu rr rr kk k aa aa bbbb uuuuuuuu rr rr kk k aa aa