If you have stumbled upon a file named while browsing PlayStation 3 modding forums, Reddit communities like r/ps3homebrew, or developer repositories on GitHub, you are likely staring at the single most important file for modern PS3 exploitation. This is not a standard Sony firmware update; it is a modified, custom firmware bridge.
A: No. RPCS3 does not require firmware installation in the same way. It uses a decrypted set of official firmware files. HFW-4.91.1-PS3UPDAT.PUP