PUP (Playstation Update Package) files are packages which contain the files used to update a PSP or PS3 system. The other PUP file version is the same, except it is zero-filled after the normal PUP content to a fixed filelength of 256MB, which gets released on Gamedisks (if gamecreators build their project to a premaster and give it to Sony for signing, they just use a placeholder of a 256MB PS3UPDAT.
Within the Retail/CEX there are 2 file versions: 1 is a PUP with a normal file length which also gets released online.
Due to the fact that it requires a licensing agreement with Sony (which is considered expensive), a number of open source and homebrew PS3 SDKs are available in addition to a number of leaked PS3 SDKs.
The Play Station 3 uses the Xross Media Bar (XMB) as its graphical user interface, which is also used in the Play Station Portable (PSP) handheld console, a variety of Sony BRAVIA HDTVs, Blu-ray disc players and many more Sony products.
Disclaimer: We are not responsible for the what you use this jailbreak for, by following the steps below you acknowledge what you are doing, and accept full responsibility for any actions you have done. This folder contains the ps3 downgrade for 4.81 ofw to 3.55 ofw.