Plug the USB drive into the rightmost USB port of your PS3 (closest to the Blu-ray drive). If using HEN, enable it now from the XMB network column.
If the PKG fix doesn't include a modified EBOOT, you may need to activate the RAP file: sonic and sega all stars racing ps3 pkg fix
Place the corresponding .rap file inside the newly created folder. Plug the USB drive into the rightmost USB