Instructions ← click here
tried that numerous times since i twas the only info I could find. it did not go to the 12/24 setting on the 6th click it went back to the beginning of the cycle with seconds. not being able to find anything with that same model number made me think it was an odd setup. I finally decided the MD in the beginning of the model number might mean military and returned the watch just now saying it would not go to 12 hour.
thanks for trying. it is appreciated.