Here’s a ready-to-use post for a forum, Reddit, or social media about downloading and installing 6.61 PRO-C2 (the latest PRO update for PSP).
1. Check your PSP version
Go to Settings → System Information. If you’re below 6.61, update to official 6.61 first (Sony’s final OFW). pro update psp 6.61 download
Transfer the File: Place the official EBOOT.PBP into the UPDATE folder. Here’s a ready-to-use post for a forum, Reddit,
PRO-C2_661.zip – contains: