How to get pictures on your iphone that you delated while ago?

So I need a photo and a couple months ago i thought I would never need it and now I NEED IT! And I have looked all online to see if there were programs and I have a Samsung black Chromebook and every program does not work or is not supported by my Chromebook. I have a Apple iPhone 4s Please help I need that picture!

If you have Photo Stream activated, this automatically makes copies of photos you take with iOS devices. If it wasn't activated when the photo was still available in your iPhone's Camera Roll, then it wasn't backed up in your Photo Stream. If you deleted the picture from the Photo Stream as well, then you're likely completely out of luck for recovering the photo.

When you delete an item, it doesn't truly erase it in most devices. It changes a marker so the system is ready to use that memory to save new items when it needs to. IPhones often have smaller amounts of memory (because it's cheaper) so it's very likely that the iPhone already re-used the space where the photo used to exist, in which case, it would truly be gone. Completely unrecoverable.

I don't recommend it, but you could perhaps jailbreak your iPhone, and then from there find a program to read deleted files that haven't had their space reused. A Chromebook won't run such a program, and I have no experience using these programs so my advice ends here.