Will I lose all my data going back from .215 to .211? Or can I keep everything?
Unless I miss my educated guess.....yes, a fast boot is equivalent to formatting a hard drive and then reloading windows with the OEM disk. It'll wipe your data and get you back to "outa the box" new
You can root, use something like titanium backup to save your apps + data but if you restore back without doing this then yes, you would lose your data.
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"She leans into me and I keep my arms around her. I don't fool myself that I hold her together -- She does that on her own -- But holding her keeps me from flying apart."