I have had the same problem before, for example the file was named PSX.Dead.or.Alive.NTSC.U.by.asdhasdhssgh and it showed up as corrupted but when i named the file dead or alive it worked fine, give it a try it may work for you. You also need to change the psx iso into an eboot to run on a psp im nearly sure, to do this i use popstationgui.
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