Source : Tuaw The bootloader is first layer of software in the iPhone; it takes control at start up, and enables the iPhone to know what it is. It is also the bootloader that iTunes will communicate with in order to install new firmware or a baseband.
It is also the route, or rather by the faults in the bootloader, that allows the hackers to modify the firmware of a iPhone in order to jailbreak or to désim/unlock the iPhone.
Knowing that this is the 'open sesame', you can imagine that Apple arranged a protection system that allowed access only through iTunes.There, still this protection lives.
However the softwareIBooter" allows (for the moment only with lines of command) to open a dialogue with the iPhone and to start, for example, a diagnosis on a failing iPhone.
It allows in
