Hi all, things are getting rather desperate and I am hoping someone here can help. I have an iPhone 4 with the original 4.2.1 preinstall. When greenpoison was released I successfully completed the jailbreak, and things have been fantastic since then. Until. I went on vacation to mexico, and soon after arriving (roaming on Telcel) I was listening to my phone's iPod when it suddenly powered off. I tried to poweron/off but the phone did not respond. I tried to hard-reset and the apple icon appeared and then the screen went black. Some attempts could get the apple (then greenpoison logo) but the phone would not boot. At one point the battery seemed to have been degraded and after that the phone was able to boot, but after 10 minutes it powered off again and the same cycle resumed. When I got home I attempted to restore the phone using Tiny Umbrella and my Cydia SHSHs. But it failed with error 1600. Now the phone will not leave DFU mode under any circumstances. iTunes sees the phone in DFU, but error 1600, I hear connects/disconnects of USB, but Tiny Umbrella does not see the device, in logs it just says that device in DFU mode connected, but nothing in the sidebar. Tried to use redsnow to get the phone into recovery, but nothing seems to work. Can anyone help? I don't mind updating to the new OS at this point, anything to unbrick!