I will show you steps to extract the files easily without any issues at the end of this post, just make sure you have enough space in your device memory card or phone storage. If you are running the PSP ROM files on Android PPSSPP emulator, you might consider searching YouTube for best PPSSPP Emulator settings on Android.
PPSSPP emulator games ROMs or Iso files are compressed into Zip, RAR, 7z format, which can later be extracted with Zarchiver app or any rar file extractor for PC or Android device after you download one of the game roms below. Download best 100 Plus PPSSPP games for Android PSP emulator, if you have one you don’t need to be looking around for which one to play on your device.