Just updated to iOS 6 but getting the iTunes error “There is no SIM card installed in the iPhone you are attempting to activate”? Here’s how to fix it.
This is a rather weird issue because you already have your SIM card inserted but iTunes is saying otherwise. What’s even more weird is that you have an iPhone 3GS which is already factory unlocked but won’t activate normally (or if you have an AT&T iPhone, and need to unlock it, click here).
If you have baseband 6.15.00 installed before, for whatever reason iTunes won’t let you activate your iPhone on iOS 6. Apple may have quietly put a this restriction in place. In case you missed the news, you can now downgrade from iPad baseband 6.15.00 to 5.13.04.
Try the following fix:
2. Launch redsn0w. Go to Extras > Select IPSW button in redsn0w to point to the original firmware you just downloaded.
3. Do a controlled shutdown of your iPhone (“slide to power off”).
4. Return to the first screen and click ‘Jailbreak’. Check the ‘Downgrade from iPad baseband’ checkbox, uncheck Cydia and click Next.
5. Redsn0w will start doing the downgrade and you will see ‘Flashing Baseband’ screen on your iPhone with the Pawnapple icon. DO NOT INTERRUPT your iPhone while baseband flashing is in progress.
6. When done, your iPhone will reboot itself and the baseband should have been downgraded to 5.13.04. Try to connect to iTunes once more and see if it would activate.
If you don’t have an official unlock, you may want to consider using this tutorial.
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