for 2 days I've been trying to jailbreak my iPhone4 5.1 on my Mac. I have updated the iTunes to 10.6, downloaded the latest version of redsnOw. When Redsn0w opens, a window pops up telling me iTunes has incomplete libraries: Failed to load required functions: CFPropertyListCreateData and CFPropertyListCreatewithData. Tells me to be sure I have installed the latest iTunes (which I have). Then when I put my device in DFU mode, redsn0W says that it has failed. But iTunes is detecting it fine!