You can patch it manually with ISO Tool (by Takka) → EBOOT.BOOT.BIN fix → then apply “Prometheus ISO Patcher” for 6.xx CFW. But honestly, just grab the pre-patched USA Fix ISO — much easier.
If you want, I can:
(e.g., Ice, Fire, Lightning) and deep character cosmetic options. Technical Achievement: tekken 6 usafixiso psp