everybody have their 4.3,.im stuck on 4.2.2,.must go back malaysia only can update,. so jelly

been quite bz now,.kies also cant update due to diff country code now
want to flash but this will be my first time flashing,.so a bit scared,.
if i flash using odin,.will i receive the smal update like 40 mb ota or i have to flash back everything again,.
this is my first samsung and have no flashing exp,.never root any phone,.jangan marah ye