HFW-4.91.1-PS3UPDAT.PUP is designed for Super Slim models and later Slim models that cannot run full Custom Firmware. If you own an original “phat” or a CECH-20xx/21xx Slim, you would likely prefer a full CFW. But for everyone else, this HFW + HEN is the golden path.
Before updating your PS3 console using the HFW-4.91.1-PS3UPDAT.PUP file: HFW-4.91.1-PS3UPDAT.PUP
: Allows users to sign in to the PlayStation Network (PSN) and play games online by matching the latest official firmware version. Installation Guide because it modifies low-level system files
The file is legitimate software produced by the PS3 homebrew community. It is a virus or malware in the traditional sense. However, because it modifies low-level system files, the source of download is critical. the source of download is critical.