2 ways. first, is to hard reset via combination keys gaya ng power-off plus volume up or power -off plus volume down+ volume up or volume - plus power off .depende sa phone kung anong combination keys. paano gawin hard reset: first power off lang yung total off tapos gawin ang combination keys tapos may option na lalabas. paalala lang madedelete lahat ng data mo sa phone if ngana ang hard reset at wag edelete ang system. para hindi ma hard brick. 2 way is to flash stock rom via pc medyo mahirap nayan. depende parin sa phone. sana makatulong.