Communicate with Bootloader of the iPhone

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 sim-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 software "IBooter" allows one to open a dialogue with the iPhone (currently only via command-line) and to start, for example, a diagnosis on a failing iPhone.
It allows, in fact, many more things, which certainly should NOT be used by everyone, such as modifying the frequency of the bus system and thus overclocking the CPU, or modify the tension of the processor - things that we more-than-strongly advise against touching.
Other more amusing functions may provoke a flowering of users: iBooter permits one to change the startup logo of the iPhone, pushing the personalization of the iPhone and allowing one to replace the apple logo by whatever one chooses.
Again: once more attention, all erroneous manipulations could lead to the destruction of the iPhone!