To play Tekken: Dark Resurrection PSP ISO EN, you'll need:

The text is still in Japanese (when you wanted English). Solution: You likely downloaded the wrong region. Check the ISO properties. The English version has a PARAM.SFO file that lists "US" or "EU." Alternatively, inside PPSSPP, go to Settings > System > PSP Model and ensure "Flash 0" region is set to America.

In this guide, we’ll dive into why this game remains a must-play and what you need to know about the English ISO version. Why Tekken: Dark Resurrection is a PSP Classic