Download Firmware Update

                          i post for new user mostly

                          where everything described clearly

                                          1.need root must

                                           to root this phone

                          first install twrp recovery on phone

                                            by odin v3.10

                                                       Link

                                   Download ROOT File

then copy the super su to internal memory of phone

then go to recovery

then install from sd card

then select super su file

power on phone

open kingo root to check root status

root success

this time must trick allow button in phone when prompt a window

2.unlocking by octopus

read info

unlock done