Some of the images appeared but most did not. Says it can't open the format and the format says .JPG. Is there any help for recovering these images?
It's difficult to say with the level of information given, but possibly not. If the image handling software says it's the wrong format, then it's doubtful that the rest of the data holds any image at all. A file name with a .jpg extension does not mean that the file contents are in a .jpg format.
You could try a deep scan, and hope that the pics are in one extent.