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The 'K' could not possibly be hexadecial. Hexadecimal letter notation only goes from A to F. Not G, not H, not I, not K.
So: That 'KA' is presumably just that: a K, and an A.
Unless it's a misprint. ([*sigh*] obviously not a cheering thought.)
The 'correct' turn-On code, is probably wrong. It has five hexadecimal groups. But you can try it.