[Q] factory reset

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http://forum.xda-developers.com – Hey everyone, I am having a little problem... I recently did a factory reset and when the phone booted back up all the files photos and folders that were there before the reset are still there. I have tried to do it from cwm with the code from the phone and from backup and reset in every case all the folders and photos and music remain. I have cwm version installed have rooted but have stock Rom on the phone, I have also noticed when I go in to my filenfolder and start browsing inside the internal sd card it seems laggy. Any help would be greatly appreciated (HowTos)