How to Downgrade Your iPhone 3GS From iOS 6.x to iOS 5.x (Windows)

How to Downgrade Your iPhone 3GS From iOS 6.x to iOS 5.x (Windows)

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Arun - April 1, 2014 at 11:52am
Hi I'm having trouble with this. After I select ipsw the progress bar goes until 99% then a dialog box appears and says "Couldn't upload iBSS. Note: iPhone 3G ios 3.1.3 BB 6.15.000 trying to restore to 4.2.1 since Edge is always on in 3.1.3 no matter what I do.