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BIOS is software that controls Motherboard Hardware on boot up . The BIOS is recorded on to a Flash chip on the motherboard. MOD chips do not depend on the XBOX’s motherboard BIOS. They all contain their own Hacked BIOS on their own flash chips. They override the original flash, that’s how they work, and most will let you switch between a Hacked BIOS or Original (disable modchip to play live games or whatever)
After the Motherboard has booted up, new BIOS files can be run from the hard drive with BIOS Loader software that resets the XBOX and then runs the hacked BIOS. This is how exploits work. But you need a way of changing files on the hard drive and if you mess up the Hard drive files without having chip installed you will be stuck with a non working XBOX and be forced to install a MOD Chip to restore the hard drive.
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