I have a 1999 Ford F-150 with an after market stereo, one of my friends was messing with it and accidentally knocked the stereo off while the key was on, putting the truck into theft mode, I was wonder what ways there are to fix this. I have tons of oarts trucks to get parts from. I searched online to see what I could do but couldn't find a thing. I was wondering if there is a computer or something that I can change to fix the problem or if there is a way to fix it. Any and all help is appreciated!

 

Sorry if this is under the wrong category, I'm new to the website and couldn't find anything to do with computers except for this category