You may be asking: "If full CFW exists, why use HFW?"
Here's why "HFW 4.91" is the gold standard right now: ps3 4921 hfw high quality
Hybrid Firmware (HFW) is a modified version of the Official Firmware (OFW) that restores an exploitable version of the Webkit browser (from version 4.82) while retaining the latest system features. You may be asking: "If full CFW exists, why use HFW
Move the verified PS3UPDAT.PUP file into the PS3/UPDATE/ folder on your FAT32 USB drive. Safely eject the drive from your computer. Step 3: Boot into Recovery Mode ps3 4921 hfw high quality
The Evolution of PS3 Customization: Understanding HFW 4.92.1