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aarisaanig
it's sure if you follow all the steps on the guide and use some common sense. Don't harm done in going CFW just minor risks regarding a bad move of the user but besides that it's ok. The guide is crystal clear so you are good to go to CFW, 250gb maybe you formated on PS3 or windows.
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mustermann88
don't know about that, since i did not care but if anyone knows will tell how to do it.