If the images were never deleted manually from the "Recently Deleted" Album, you might can recover them. In other words, if their time in recently deleted ran out. They are likely recoverable. Here's how:
1. Go to Settings >General >Date and Time> Toggle off "Set Automatically".
2. Set the time back 1/2 years.
3. Go to the Photos app and check the recently deleted " album. They may be there.
4. Tap "Select" in upper right corner.
5. Mark photos to recover.
6. Tap "Recover" in bottom right corner.
The deleted photos should be back on the camera roll.
This works if you show huge space taken by photos, but don't have that many. So if in Settings > Usage, it says your photos take 2.3 GB, but you only have 250 photos on the camera roll, then this works to delete those deleted photos.
7. Go back to Date and Time and toggle "Set Automatically" back on.
If the above method is not work for you, you should use an
iPhone photo recovery software to get lost photos back.
