There is no "official" Minecraft 574. If you find a file with this name, it is almost certainly a community-patched version of Lamecraft (the most famous PSP Minecraft clone) or a texture pack injected with a specific build number to attract clicks.
If you are looking for the latest stable build or specific "exclusive" ISOs, here are the most recommended versions from the community: Minecraft PSP Edition (RegenStudio) minecraft psp 574 download exclusive iso
To run these unofficial ISO or EBOOT files, your PSP must have installed. Can a 15 Year Old Sony PSP Run Minecraft? There is no "official" Minecraft 574