By using this app you can know exactly in which country your phone was manufactured. So you can choose the correct firmare to flash.
You can know your version of Bootloader to decide which method to use for root, if the Knox will be triggered, which version of firmware can be exceeded …
Supported Android
{4.1 and UP}
Supported Android Version:-
Jelly Bean(4.1–4.3.1)- KitKat (4.4–4.4.4)- Lollipop (5.0–5.0.2) – Marshmallow (6.0 – 6.0.1) – Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1) – Pie (9.0)