Upon restarting, the Xbox detects the clock is invalid and the process repeats. The Xbox will detect that the clock isn't set and therefore force the dashboard to be loaded which then promptly reboots due to the buffer overflow exploit. Unfortunately, since the Xbox requires the clock to be valid and the dashboard itself is where you set the clock there is problem if the RTC backup capacitor discharges. The Font-hack works by exploiting a buffer underflow in the Xbox font loader which is part of the dashboard. Originally, via a piece of software called "MechInstaller" created by members of the Xbox-linux team, an additional option could be added to the Xbox Dashboard for booting Linux. Usage of the Splinter Cell or Tony Hawk's Pro Skater 4 disc is generally recommended as any version of the game will run the exploit, whereas certain production runs of Mechassault and Agent Under Fire are needed to use the exploit. Softmods for Xbox used to include a font exploit installed through exploits in savegame code for MechAssault, Splinter Cell, 007: Agent Under Fire, and Tony Hawk's Pro Skater 4. Softmod is also a term used to refer to modifying an Xbox without the use of a mod chip. The softmodding is not guaranteed to always work sometimes the pipelines have been disabled for a reason, e.g., a defect that produces artifacts when enabled. A softmodded card may not always reach the same performance as the real card it has been changed to, but the difference should be very little and generally not noticeable. The act of a softmod usually enables pixel rendering pipelines, though may also include other enhancements. Currently only four softmods are known, a Radeon 9500 NP to a 9500 Pro (128 bit) or 9700 (256 bit), a Radeon 9800SE (with 256-bit L-shaped memory layout on the PCB) to a Radeon 9800 Pro, a GeForce 6200 to a 6600, and a GeForce 6800NU to a 6800GT. Softmodding a card should not include changing the video card's BIOS, as that is a BIOS flash. Video cards that can be modified using software to faster versions (without regard to clock speed) usually contain mostly the same hardware.
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