I have tried jailbreaking my ipod touch several times. It worked out the first time, but some of the sources i added were not working properly. So, i thought i should downgrade the firmware. I tried 1.1.3 and 1.1.4 and again 1.1.5, yet each one of them even if zIphone says that the jailbreak is complete. There is no installer application icon. I have been restoring and rebooting several times. It still has not work. Does anyone have any other suggestions?