If you are looking for flashing your mobile stock rom with new and latest firmware. You will need Odin software. But how you can use this. well this is the complete all in one package for you. Lets get started.
(Note) Before we proceed to flashing process I need you take the full backup of your data either on cloud or in any other computer or memory device this is essential because flashing will erase all of your mobile data during updating process. So don’t avoid this step.
Download and install Samsung USB driver for your phone
Download and extract your stock file for your phone
Turn Off your phone
Press and Hold Volume Down + Home + Power Button for 8 seconds
Connect your phone to laptop or computer in which Odin software is installed
Launch Odin by double clicking on it.
Check if Odin has access to your phone aka they are connected.
Now browse the downloaded ROM file and then click on add button
Now it will take 20 to 30 minutes to completely install the ROM file. After that you have successfully Flash your phone with new ROM. Now Enjoy latest functions on your phone