Have a Nexus 7 (2012) and accepted the android 5 update last night. Can't keep too many apps open now or the tablet freezes, keeps losing wifi and takes an eternity to complete the simplest tasks. Chrome is pathetic and keeps freezing. I want kit kat back please. Can someone tell me how to get it back? If I can't return then the tablet is heading for the garbage as it is of no use whatsoever...thanks Google!