Default looking for official rom to manually install on s3 gti 9305 model

Hi all, i got my s3 from france it was originally network locked , and now its code unlock . im in pakistan (asia) now and want to upgrade to 4.3 but cannot find which rom to install there are so many roms with regions dont know what regions have to do with roms. so plz can some 1 post the link for my mobile so i can download that specific rom. And sorry admin i wasnt able to post it on its real location coz i wasnt able to post there dont know why.