Nokia :: Arabic Language Pack

bought a nokia 5800 from hong kong with preinstalled chinese and english language, but my bro recently purchased a nokia 5530 from the same place, and it also has the same language packs preinstalled. however, the 5530 can view the arabic font (but not write in arabic) as in if he gets a txt messeage in arabic, but my 5800 cant? anyone knows how i cud install the arabic language pack in my 5800. i know they are already preinstalled by nokia, but since stores can do it, then there must be a way to do it!