I recently got my iPod Touch via warranty replaced by a brand new one!! The firmware installed is 4.3.5... As an untethered jailbreak for this firmware hasn't been released yet (or even never will be) I tried to downgrade to 4.3.3 although I haven't got any SHSH blobs saved. Following an instruction that I THOUGHT to be "trustworthy" on here: http://www.limera1n.cc/2011/08/downgrade-435-to-433-without-shsh-blobs.html I jailbroke the iPod Touch 4.3.5 with redsn0w_win_0.9.8b5 (software used to jailbreak iOS 5 beta). In the jailbreak software I browsed for firmware 4.3.3... -.- See all the contradictions? Ever since I cannot restore my iPod Touch. I keep getting error 1600!! or error 21. I can't even restore to the newest firmware. Putting my device into DFU is no good either. And I even can't reset my iPod on the device itself through SETTINGS. The awaited loading bar doesn't appear and I saw was an apple with a loading circle...even after 7 hours trying to erase all data the screen wouldn't change. And neither can I open Safari. It simply crashes!! I even tried to put my device into pwned DFU mode with iREB but I only get the ordinary DFU mode. My warranty is still valid valid...but I can't claim it as long they see the CYDIA icon. Now did I brick it because I tried to jailbroke ios 4.3.5 with a software for ios5 and on top on it browsed for 4.3.3? To all of you: Never ever try to downgrade without shsh blobs! BIG MISTAKE! Big one... Please help!!!!!!!