may cua em sau khi update may tro choi trong cydia thi may bat restart lai may.sau do thi khong khoi dong lai duoc may.ma may cu hien len hinh qua tao.cho den khi het pin.em cam sac va khoi dong lai home+power nhung van khong duoc.em cam vao may tinh nhung itune khong nhan duoc may.may em bi lam sao the? giup em voi.em chang biet sua nhu the nao ca...:banghead: