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My 3GS 3.1.2 (MC serial #) all of a sudden cannot be blackra1ned now. It comes up with Geohot image, then shuts down about 3 seconds after that. I've been googling for the last 4 hours, but I'm not sure I want to try different iTunes restoring methods. Please, please help! Thanks!
This is most likely a known problem caused by the way rock.app incorrectly updates some core Cydia packages. Short version. Rock.app is trouble, once you get your iPhone working again - uninstall Rock.app and use ONLY cydia.Quote:
Originally Posted by qt8707
There are a number of fixes for this. They seem to all be a modified version of redsn0w that has been changed to apply the fix instead of install Cydia.
See: [SOLUTION] iPhone shut off during boot / Stuck Apple Logo for an explanation and utilities to fix this.