Samsung firmware update

[imaz10]

Hi guys. My phone shows SMG975N in model number and SMG975F in service provider. I need to install stock Samsung firmware. Should I download the one for SMG975F or the N? Also tell me what happens if I download the firmware of some other country

[user9992112]

have you rooted your phone?

[AliRazaShafi]

can you upload the complete screenshot of the "Software Information" menu?