PS3UPDAT.PUP is the filename of the official firmware update package used by Sony’s PlayStation 3 console. The extension .PUP stands for (or sometimes informally "PS3 Update Package"). This file contains a signed, encrypted system software update that can be installed via USB storage device, network download, or optical disc.
Over the PS3's lifespan, the PUP files evolved significantly: Feature Expansion: firmware ps3updatpup
In the early days (firmware versions 1.0 through 3.15), the PS3UPDAT.PUP was generally welcomed by the community. It brought new features: DVD upscaling, in-game XMB access, and support for Trophies. PS3UPDAT