How to Unroot,lock OEM and make phone as it was!

[magnaspurcenal]

Can someone help me lock the boot loader I have unrooted it but not able to lock OEM

 

[ashwin_tembhekar]

best way is to flash the original official firmware through odin .

 

[Sylus27]

Have you managed to lock it? I'm thinking of unlocking the bootloader but only if there is a way to relock it again.