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yes it wipes out all the data from your device, even the data on the rom.
youll find all the information you need on the support page.
and for the changes you can read the improvements and bugfixes and decide to upgrade or not.
i personally choose not to update, and wait for wm2003 update because rom updates can be dangerous
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I used to think, that the universe is a random caotic sequence of meaningless events. But i see now that there is reason and purpose to all things.
Jerry Seinfeld
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