If you cannot get the patch working, or you want a more complete experience, consider:
Join the Ultraman Games Discord. Members share pre-patched ISOs (for legal owners), custom plugins, and even texture packs for PPSSPP that replace Japanese UI textures with high-res English ones. ultraman allstar chronicle psp iso english patch
Because the game was Japan-only, physical UMDs can be bought on eBay, Amazon Japan, or second-hand stores like Suruga-ya. Once you own a copy, you can dump your UMD to ISO format using a hacked PSP with custom firmware (CFW) or a compatible optical drive. If you cannot get the patch working, or
Alternatively, the ISO circulates on archive sites (search: “Ultraman Allstar Chronicle [ULJM-06256]”). Verify the CRC32 hash matches: B3F21A8C for the clean, unpatched version. Because the game was Japan-only, physical UMDs can