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It is easy enough to add one to the Calibre library by copying it manualyy to the folder inside the Calibre library that holds the eBook file and calling the file "cover.jpg". However I do not think there is any way to stop Calibre resizing it to fit the maximum resolution of the device specified in the your output device profile. You can always try by putting the file there and running the conversion to .LIT.
There may be other tools around tht can handle .LIT files that would do what you want - you could try Googling for them.
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