i want downgrade to 4.1.1 but i can't, any idea how to make the downgrade?
From what I have done with my Canadian s3, which is an i747m, I can downgrade from 4.1.2 to 4.1.1 with no problem via Odin. The bootloader is not locked. As far as I know, the only bootloader the could be considered "locked" would be in the stock 4.3 ROM. Once your phone is on 4.3, you cannot downgrade the bootloader.