if you have applied yifanlu's jailbreak and installed usbnetwork, you can ssh into your KT from a terminal. then you can freely move around the file system, copy the reader.pref file, modify it, and copy it back.
i found that ixtab is correct that the VI included in the jailbreak tools will not convert the hex, so it is necessary to copy the reader.pref file to your computer where you can use a hex editor.
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