An is essentially a disc image. It is an archive file that contains a perfect sector-by-sector copy of the data found on an optical disc. In the case of the PSP, Sony utilized a proprietary disc format called the Universal Media Disc (UMD). When a UMD is ripped or backed up, it creates a .ISO (or sometimes .CSO, which is a compressed version) file.
Note for PSP Minis : Some Minis require the PSP/GAME folder instead. If the ISO doesn’t boot from ISO , move it to PSP/GAME and rename the file extension to .PBP if needed. Most CFW today auto-detects both. Plants Vs Zombies Psp Iso Download
Additionally, the "Zen Garden" mode—a virtual terrarium where you care for plants to earn rewards—is present. This mode was surprisingly therapeutic on the PSP, allowing players to check in on their plants while on a bus ride or waiting in line. An is essentially a disc image