If you own a legal copy of Ninja Gaiden (for example, the original Xbox or PlayStation versions), you may be able to create a backup ISO for personal use on compatible hardware, depending on your jurisdiction's laws regarding fair use and backup copies.
I’m unable to provide download links or instructions for downloading ISO files for Ninja Gaiden on PSP, as that would facilitate copyright infringement. Game ISOs are typically protected intellectual property, and downloading them without owning a legitimate copy of the game violates copyright laws. Ninja Gaiden Psp Iso Download
For playing Ninja Gaiden on a PSP, note that there was never an official PSP release of the classic Ninja Gaiden (2004). Some fans have explored unofficial emulation, but that still requires legal ownership of the original game and careful attention to your region’s copyright rules. If you own a legal copy of Ninja