I was happily running with 6.01 JB when I ran into a problem that needed a restore. This restored my 3Gs to 6.1.3. I am now running a tethered JB. Just out of curiosity I downloaded and ran Tiny Umbrella, with the result that the log says "You have saved your iPhone3GS 6.1.2 (10B146) SHSH locally. In my User directory I now have a file "3625053246862-iphone2,1-6.1.2.shsh". My IPhone setting say I have 6.1.3 (10B329). I am confused? Can I downgrade to 6.1.2?