Bootloader
There are at least two bootloaders in the iPhone. One is the ARM Core Bootloader and deals with the Operating System, the other is the Baseband Bootloader. Bootloaders make sure that when the iPhone boots it is doing things in the right order, and getting everything done. Currently the iPhone has shipped with two different Baseband Bootloaders (3.9 and 4.6). The 3.9BL allowed us to load a hacked baseband which matches the firmware version. Apple changed this feature in the 4.6 BL and made it require a baseband of a newer firmware version. This is why the Dev Team has released a 3.9 fakeblank BL which allows you to load a hacked baseband matching your firmware version.
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