• Make sure your device is at least 30 percent charged to perform flashing. • Switch off the mobile • Press the Power + volume Down then volume UP to continue Phone will turn into Download Mode. EASY WAYOR • Press the Power + volume UP Phone will enter in Recovery mode then select Reboot to Bootloader by pressing Power Key. • Phone will turn into Download Mode. • Now open the Odin flash tool • Select Samsung SM-J250F • Select the Odin tool and open it • Select BL file • Click AP or PDA then select AP File • Click CP and select Modem File. • Click CSC and select CSC File. • After selection mobile will get detected automatically • Now click start on system & installation is in process • After installation mobile switch ON of its own.