To stay on the right side of the law, the recommended approach is to use your own legal copy of WWE SmackDown vs. Raw 2011 for the PSP. Using specialized software, you can then "dump" or create an ISO file from your own disc. Once you have that legal backup, you can apply the fan-made modification patch to turn your personal copy of SvR 2011 into the "WWE 12" experience, without ever downloading a pre-patched ISO from a third party.
Step 3: Install Save Data and Textures (Crucial for WWE '12 Mod)
WWE '12 PSP ISO File Download Exclusive: The Ultimate Guide for Mobile Gamers