Softmods for Xbox used to include a font exploit installed through exploits in savegame code for MechAssault, Splinter Cell, and 007: Agent Under Fire.
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Using various exploits (such as the TIFF exploit or specially crafted savegames from games such as Grand Theft Auto: Liberty City Stories, Lumines, and later GripShift) or original unprotected firmware, the user can run a modified version of the PSPs updater, that will install custom firmware.