Steps how to downgrade previously jailbroken iPhone 3GS/iPhone 4 from iOS 4.1 and 4.0.2 to 4.0.1 or 4.0. firmware on a Windows PC and how to recover from (1011, 1013 or 1015) error(s) (aka stuck in recovery mode).
**UPDATE!** 8/31/2010 For those wanting to know if you can get a New out of the box iPhone 3GS and iPhone 4 downgraded out of the box see the link below.
http://www.redmondpie.com/downgrade-iphone-4-3gs-from-ios-4.0.2-to-4.0.1-without-shsh-blobs-saved-guide/
SHSH blobs MUST be saved to Cydia to do this on Newer iPhone 3GS and iPhone 4 devices.
tiny Umbrella can be found here... http://www.iphoneheat.com/2010/06/tin...
You will want to use Tiny Umbrella or RecBoot to kick your iPhone 3GS or iPhone 4 out of recovery mode. I recommend Tiny Umbrella for it's easy of use and because it allows you to save your SHSH blobs on cydia.
Info on DFU go to http://www.mob2all.com/2010/06/how-to-put-your-iphone-into-dfu-mode.html
**You do this at your own risk! This is Informational only! if you screw up your computer or iPhone because you did not know what you were doing you can only blame yourself! Follow them at your own risk. I am not responsible for any loss of data, or malfunction of your iPhone or computer**
Here is a great link to a written tutorial..
http://www.redmondpie.com/fix-itunes-1004-1015-error-and-restore-iphone-4-3gs-successfully-on-ios-4.0.1-how-to-guide/
RecBoot info and download can be found here.. http://www.sebby.net/659-released-rec...
**If you do not follow RecBoot steps properly you can mess up the USB drivers on your computer and your computer will not see the iPhone when it is connected!**
If you download the iOS firmware and it has .zip extension and you need to get it to .ipsw extension and you need to know how to change file extension in Windows see my new video.. http://www.youtube.com/watch?v=rZ8hJu...
