I have a Canon sd630.The camera works great except

I have a Canon sd630.The camera works great except that it won't remember its settings. Upon turning on the camera,it would say it's in manual mode, but if I change it to automatic and then turn it off. It would be back in manual mode again. I have reset the camera and even taken apart to replaced the internal battery. Still no luck. Appreciate any help.

f.y.i

I have tried looking for a firmware update, but no luck either. I was wondering if I could flash my camera with the sd500 firmware? I just hope to get the camera to remember the settings once the camera is turn off. Its like someone lock the camera to a preset settings and every time the camera is turn off, resets itself