Unfortunately, I don't have a link for camera firmware. If it was recently repaired, I might suggest taking it back to whoever did the repairwork and have them fix the issue for you. I'm not sure it would be a firmware issue.
Where can I find firmware for Samsung Digimax A402?
Photo size(2272x1704) was 1200-1350 KB, and after repair on BY now it is 800-850 Kb, and not sharping.
Operating system - Windoows XP.