lollipop 5.1.1

for anyone whofind it difficult to unlock this phone step by step: é 1- download firmware from z3x under the name: G531FXXU1AOH1_G531FOXX1AOH1 2- download the system firmware under the name: G531FXXU1AOH1_ROOT_SYSTEM 3- flash the phone with the firmware of the first step using z3x flasher...