Need a reflash

Long story short i was installing toms tune and ended up losing my stock tune. I was told by both diablo and Tom to go to ford and have them reflash my computer to stock before i could get my tune to work. I went to a local dealership and they told me that i there equipment said i had the most current stock tune even though it has the original predator tune. I asked them if they could force a stock tune on the vehicle and they said they cant rewrite a stock tune over an already stock tune even though i know the predator tune is on the vehicle. Are they just dumb techs or can i never get my stock tune again. Please help i hate ford techs and need to get my stock tune back.