The original PSP version of Resident Evil 4 (often titled Resident Evil 4: The Another Order or included in the Biohazard 5th Anniversary pack) is roughly 1.2GB to 1.6GB. To reduce it to , the file has been heavily compressed using methods like:
If you own the original PSP UMD disc, you can dump it into an ISO using a custom firmware PSP, then compress it to CSO using software like or CSO Compressor to reach ~200MB. download resident evil 4 ppsspp 200mb