Use these queries:
"psp chd"
"PSP CHD USA"
"Redump PSP CHD"
Look for uploads by users like @retroarchives, @psp_chd_set, or @mame_roms.
"CHD-Catalog for PSP: One-Click Ready-to-Play Library"
Step 1: Navigate to archive.org and search "PSP CHD" or "Redump PSP CHD".
Step 2: Identify a trusted uploader. Look for user names like RetroGamer74 or RedumpPreservation (check the comments for verification).
Step 3: Review the file listing. A proper set will list .chd files alongside a .md5 or .sha1 checksum file.
Step 4: Either download individual CHD files (if you want specific games) or use a download manager like JDownloader 2 for bulk downloads.
Step 5: Verify checksums (advanced users) to ensure your files are not corrupted.