Cm12 for HTC 816 virgin mobile

Hi I don't really know how to flash Roms or do such I just want to update because i heard we can get more available space and the features. I am just wondering will this remove my flashed files because I believe I flashed a bad zip through cwm and my phone now sometimes reboots when I use su. I pretty much just want to install this and have all previous files removed. Can anyone help me get this?

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