Made the mistake of trying to JB w/new Greenp0ison 4.2.1 without upgrading to actual 4.2.1 first (was on 4.0.1 JB) Got the "your phone is in restore mode...." msg in iTunes. After trying to put phone in DFU mode, it will no longer boot at all. Just dead. Very upset and frustrated, in desperate need of assistance. Thanks in advance.