What's the directory you put it in? It should be in a folder on the root of your memory stick called ISO. So it should be f:/iso/something.cso. If it still doesn't show up try making a PSP folder on the root of your memory stick and then making a GAME folder inside of that folder. Keep the cso in the ISO folder still.
Try what I've edited in my post above, it's worked for me before. If the cso still doesn't show up then the cso must be corrupted somehow. Use umdgen to convert it to an iso. Some games I have compressed get all messed up and won't be recognized by my psp. flow is an example.
I got it to work. I have no reason why it wouldn't work before but after I reformatted then put the CSO back on it started working again. (That was like my 3rd time reformatting..)
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