Why am I not able to downgrade my iPhone 3GS baseband?
I am trying to downgrade baseband 6.15 on ios 6.1.6 iPhone 3GS with redsn0w 9.15b3 without any success. The downgrade starts just fine, however, I never see the Flashing Baseband. It directly jumps to Activating that stays there for some time and then the iPhone reboots. When checked in the setting, no baseband is listed. My iPhone has no service, no wifi, no Bluetooth after the jailbreak and baseband upgrade to 6.15 and it reboots every 2 minutes. The iPhone was manufactured in 2010, production week 14, first five digits of serial no are 81013. Restore in iTunes fails with (-1) error. I have been trying for the last one week and I think I have hit the wall. Any help from the free spirit of the Apple shackle breakers is greatly appreciated.