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You can't.
If you want to completely remove all your data from using the One and start again the easiest way would be to create a new fitbit account (although you'd need a different email). If you want to keep your current account and email and remove all data then you'll need to contact customer support: contact.fibit.com
Out of interest, can I ask why you want to do this? The normal question I see is whether you can keep your old data when changing fitbits.
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