Ensure your PS3 is running Custom Firmware (CFW) or has PS3HEN enabled to install third-party packages.
That said, it won’t fix dying hard drives or severe file system corruption. For those cases, you’ll still want a full backup and potentially a drive replacement. Download Kdw Rebuild Database Ps3 Pkg
Navigate to > Install Package Files > Standard . Select the KDW Rebuild Database PKG to install it. Run the Tool : Ensure your PS3 is running Custom Firmware (CFW)