Pioneer DVD D-270

I changed the settings on my DVD player Pioneer D-270 to progressive scan only to realise that my TV does not have the necessary resolution to support it. Now, my display is as if the V-hold of my TV has gone for a high jump. Hence, I am not able to reset the settings i.e., I am not able to get rid of the progressive scan feature set on my DVD player. Can anyone suggest a way out please?