Unfortunately your device's hardware is not compatible with those later OS versions, as the way in which they interface with hardware is completely different from earlier, RAM-based operations. Further, it is very unlikely there is even enough physical memory available to install any version of WM5 or WM6. I think your best 'option' is to enjoy your Viewsonic device as it is, and if you need WM6 or 6 or 6.5, to purchase a more recent device.
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