"Mods": Many "highly compressed" ISOs found online labeled as Resident Evil 4 for PSP are actually modified versions of other games (like

Some popular highly compressed versions of Resident Evil for the PSP include:

The true white whale is the lost Capcom title. In 2009, Capcom showed a single screenshot of Resident Evil Portable —featuring Jill Valentine in her RE5 battlesuit. The promise: a PSP-exclusive action-horror title.

When looking for "highly compressed" versions, you are likely encountering two types of files:

When downloading highly compressed PSP ISOs, be cautious:

If a game crashes, try converting it back to a standard ISO or using a lower compression level (Level 1–5 is usually safer than 9).