WWE 2K14 is a well-regarded wrestling game from 2013 originally released for consoles (PlayStation 3, Xbox 360, and PC). The PlayStation Portable (PSP) did not receive an official WWE 2K14 release. That makes any "WWE 2K14 PSP ISO" an unofficial, fan-made, or pirated item rather than an authorized Sony or 2K release. Below is a concise, reader-friendly blog post that explains the situation, alternatives, and legal/ethical considerations.
Most fans today play these ISO files using the PPSSPP Emulator, which is available on Android, iOS, and PC. This allows for "smooth graphics" and high-definition resolution that far exceeds the original PSP hardware. Installation Steps for PPSSPP: psp iso wwe 2k14
Recommended PPSSPP Settings for WWE 2K14 ISO: WWE 2K14 on PSP: What You Need to
30 Years of WrestleMania: A campaign mode recreating 45 iconic matches from WrestleMania history. Download and install ISO Loader : Recommended PPSSPP
Here is the guide for the most common method: The Modded ISO (PSP gameplay).