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The only way you could feasibly dual boot between WM2003 and WM5 without being a god in the embedded hardware field would be to find an identical (and I really mean identical) set of flash chips and somehow piggy-back them on top of your current flash chips with wires coming off the chip select pins in order to enable one chip and disable the other.
Of course this ignores the fact that it would likely draw more power, be difficult if not impossible to install, have the chance of completely corrupting both ROMs if you flick the switch at the wrong time and the fact that the chips are BGA and so are completely impossible to piggyback on top of each other.
Other than that I think you should go for it.
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pencil and paper: n.An archaic information storage and transmission device that works by depositing smears of graphite on bleached wood pulp. More recent developments in paper-based technology include improved ‘write-once’ update devices which use tiny rolling heads similar to mouse balls to deposit colored pigment.
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