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Normally the codes would be downloaded automatically from a server but sometimes the server would go down due to negligence because it would be owned by the school and well, student's laptops would start getting locked and they would have to go to a specific office somewhere in the city to get an unlock code from the it admin
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It could be disabled from the bios somehow if you knew the bios password or the bios could be reflashed with a programming Clip directly on the bios flash chip itself.
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Normally you have to unlock the phone before unlocking the bootloader, and that is the protection.
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I would think they are guessing most people's passwords are weak or something. Like a screen pattern is weak, can be broken in just 300k attempts or maybe less because people use the same patterns and people can't be bothered to use passphrases.
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A screen pattern is a different way to enter a PIN with no duplicate digits. Both PINs and patterns rely upon the security processor to resist bruteforces.
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