Yesterday I passed my PC to my PSP some pictures taken with digital camera, all were taken about the same time and all have the same resolution and are the same file type (JPEG)
but for some reason some of the images are not in my psp,

store in the same folder at the same time, are about 25 masomenos and about half of the images if they are fine but the other half instead of seeing the picture is a box with a question mark (?) and next states : unsupported data
which do not understand it is assumed that all images are identical and if you really are not compatible then niuna of 25 would be, but instead are some but not all

My memory still has enough space, the files are perfectly, not damaged, and if the way to a PC are fine, but I want them directly on my psp


someone could help me solve my problem?
they would appreciate much