hello i have Samsung tab 4 and it was on kitkat version . recently Samsung offered update to lollypop 5.0 and I updated and now running on lollypop 5.0.1 . i want to clean my device to get rid of lot of unwanted datas to free some memory. so my question is do i loose my lollypop version and go back to kitkat or my lollypop version will remain unaffected? i scared of loosing new lollypop , so suggest me frens.