So, you just downgraded to 1.1.1, jailbroke your iPhone, and installed OktoPrep. Now you upgraded to 1.1.2 in hopes of the glorious 1.1.2 jailbreak, but you have one problem now. Conceited software's 1.1.2 jailbreak CANNOT FIND YOUR iPHONE! No worries! It is most likely because the iTunesMobileDevice.dll is of 7.4 origins, and you need the 7.5 version, which I will supply to you here. Download *If you have any problems/questions feel free to ask here!