After Flash make reboot from recovery
You must make (reboot to system) from recovery after flash
You must make (reboot to system) from recovery after flash
You must make (reboot to system) from recovery after flash
after flash make reboot to system from recovery
A520SKSU3CSA2 A520SSKC3CSA2 ( SKC) 4 FILES FIRMWARE 8.0.0
A520S U2 7.0 Firmware