How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

How to Downgrade Your iPhone 3GS, 3G Baseband for Unlock (Mac)

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seff - February 2, 2014 at 8:48am
somehow I managed to flash 06.15 baseband from 05.16 on my 3GS, but any attempt to downgrade 06.15 to 05.13 ends with a redsn0w message "the connected device doesn't support untethered options". any idea what could it be and whether there is any runaround would be greatly appreciated