If save doesn’t appear: rename folder to match your region’s save ID (check by making a dummy save first).
For a visual walkthrough on unlocking all characters or using external save data, check out these guides: DBZ SHIN BUDOKAI 2 - Unlocking All Characters - Full Game SlipNoodles YouTube• Oct 2, 2022 Dragon Ball Z: Shin Budokai – Save Games - GameFAQs dragon ball z shin budokai 2 psp save data extra quality