Hi Everyone Thank You For Your Time. By accident i recently updated my IPHONE 3GS with 6.1.3 IOS firmware, Now i wanna downgrade the IOS firmware to 4.1 (i know apple is still signing this). The issue is i jailbroke my IPHONE 3gs with redsn0w 15 (tethered) now it is stuck in DFU loop. When i try to restore the firmware it gives me error 25. I recently EMI unlocked the phone. Inorder for the phone to unlock i have to downgrade my BB from 06.15.00 to 05.13.04. Can anyone suggest me a way to do this ? Because i am using a tethered jailbreak i can't use redsn0w to downgrade ipad baseband which i was using to unlock the phone using ultrasn0w.