I just looked,it said there is no upgrade for the mogul. Assuming that the board is actually wired for the larger chip,you would need to program the new chip,and then install it. (The chip contains both the flash rom and the ram) The biggest problem of course is getting a source of the chips. Installing the chip requires some tools and skills that are not particularly common,but not particularly exotic either.
The long and the short of it is,I while it may well be possible (in fact,the odds look pretty good) no one that I know of has done it yet.
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