The guys at appleturk.net ( makers of iReb – the itunes 16xx error bypasser ) have released iReb 3.1 which solves the crash problem on windows and mac and also, as promised, they have released a tool for 3GS users ( which was a surprise ) that saves your ECID and SHSH so you can downgrade your firmware even after apple releases new firmwares and stops signing the old ones!!!
To download iReb go to http://ih8sn0w.com ( where ‘0′ is a zero ) and click the Windows or Apple logo depending on your OS.
Then, you can run iReb and follow the onscreen instructions.
For the custom firmware, you can either create one using this on mac on download one and use it for windows.
Screenshot:
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