Samsung has released Samsung Galaxy A8 and \A8+ (2018) and so far there are two models. Galaxy A530F & Galaxy A530G. Both have been patched into three security levels. (U3) In this Article you will find full Firmware files files for above mentioned device.
Why you need firmware? You can use firmware for many reasons like upgrading Android system, downgrading Android system, fixing different errors, fixing hard brick and softbrick etc.