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PSP games downloaded from the web cannot be read directly while compressed inside a .7z file. Right-click the downloaded file on your computer.
Your PSP must have Custom Firmware installed (e.g., PRO-C, ME, or similar). If you haven't done this, look up "How to install Pro-C2 CFW on PSP" as discussed in YouTube guides .
You should see the Plants vs. Zombies icon and background art appear. Press to boot the game. Troubleshooting Common Issues
However, a highly optimized, official version does exist within the PSP ecosystem via the PlayStation Minis program. This guide will walk you through the process of finding, downloading, and installing the Plants vs. Zombies PSP ISO/CSO using popular ROM archives like CDRomance, and getting it running flawlessly on your custom firmware (CFW) enabled PSP. Prerequisites: What You Need Before Starting
A program like WinRAR, 7-Zip, or PeaZip to open compressed archives. Step 1: Downloading the Game File from CDRomance