: Flashing incorrect files for the wrong binary version (U3) can permanently brick your device.
: Rooting will permanently trip the Knox counter, voiding your warranty and disabling features like Samsung Pay and Secure Folder.
with U3 firmware on Android 8.0 Oreo, you must unlock the bootloader, install a custom recovery like TWRP, and then flash a root package such as Magisk.
To root a Samsung Galaxy A3 (2017) model Go to product viewer dialog for this item.
: Unlocking the bootloader and rooting will perform a factory reset, erasing all data.