Hfw-4.91.1-ps3updat.pup -

No. Sony’s 4.92 prevents downgrading. You would have to either wait for HFW 4.92 or use a hardware flasher to revert.

Before proceeding, it’s vital to understand what this file does not do. Installing HFW-4.91.1-PS3UPDAT.PUP does give you a Custom Firmware (CFW) like Evilnat or Rebug. HFW-4.91.1-PS3UPDAT.PUP

: The file must be named exactly PS3UPDAT.PUP and placed inside that UPDATE folder. HFW-4.91.1-PS3UPDAT.PUP

: Format a USB drive to FAT32 and create a folder structure: PS3 > UPDATE . HFW-4.91.1-PS3UPDAT.PUP

The PS3 will then check for and apply the update. Follow any on-screen instructions to complete the update process.

HFW-4.91.1-PS3UPDAT.PUP file is the official installer for PS3 Hybrid Firmware (HFW) version 4.91.1