DESCRIPTION

Download and install ODIN in your computer 

install samsung usb driver with updated version

download firmware 

now 

press vol down + home + power button 

after android logo will apear

volume up for continue firmware installation

now open odin.exe

and add firmware on boot /  AP depends upon your odin version and green line on top left will show the com port number

then click on start and wait up to process complete and your phone will restart again

thanks 

please share and donate if really solve your problem

※Please make a backup of your device before installing or updating ROM