To play the game in English, you must apply the translation patch to a legal copy of the original Japanese ISO file.
The (Yakuza: Black Panther) English translation for the PSP is a fan-led project that finally makes the Japanese-exclusive title playable for English speakers. Best English Patch Options Kurohyou Psp English Patch
If the patch fails, your ISO is likely a different region or a "pre-patched" version. You need a clean, untouched Japanese dump. To play the game in English, you must
Both games currently lack full translations for "hostess" content, though To play the game in English
: Use a tool like xdelta UI to apply the .xdelta patch file to your original ISO.
Here’s a concise write-up for the English fan translation patch for PSP.