Without these, the PS3’s OFW will simply reject the Bkpps3.bin file as corrupted or unauthorized. If you place it on a USB drive labeled "PS3/UPDATE/" and try to install it, the console will either fail the hash check or throw an error (typically 80029C55 or 8002F157).
There is a known trend: fake "PS3 backup unlockers" that are actually keyloggers or Bitcoin miners for Windows. If a file claims to work on with no prerequisites—especially one as obscure as bkpps3.bin —assume it’s a scam. Bkpps3 Bin Ofw