However, using HFW to play downloaded PS3 ISOs of games you do not own is piracy. This article does not condone that. HFW is legally used for:

Search for “HFW 4.91.1 PS3UPDAT.PUP” from a reputable homebrew forum (e.g., PSX-Place, Wololo.net, or the official GitHub of the developer “Joonie” / “Habib”). download from random file-sharing sites. Always verify the SHA-1 or MD5 checksum. The correct MD5 for HFW 4.91.1 is typically f7a3b8c9d0e1f2a3b4c5d6e7f8a9b0c1 (example – check actual release notes).

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HFW-4.91.1-PS3UPDAT.PUP