Your dependant on that country pushing out updates and if it was supplied by a network originally then it'll have that networks flavour of firmware on it and are dependant on them allowing Samsung to push out the updates.
However there is options.
Look on the xdadevelopers site to learn about custom roms.
Learn about the pros and cons of performing this process too.
A person doing this does so at their own sole responsibility knowing that a phone can be put Into an unusable state and possible manufacturing warranty being voided.