Updating firmware on unlocked iphone
One night, Randy was synching his i Phone with his i Tunes when he was prompted that a new firmware upgrade is available.So Randy eagerly let i Tunes to update his i Phones firmware fro 1.1.4 to 2.2.0. After the reboot, he was shocked to see a message like this: Even more shocked when he realized that his i Phone has “locked” and could only access the emrgency numbers.If you use ultrasn0w or Gevey SIM to unlock your i Phone, here’s the ultimate guide to safely update to i OS 5.1.1 while preserving your baseband using the latest version of redsn0w. Turn off Airplane Mode and you will see ‘SIM FAILURE’ and tap OK. UPDATE: AT&T i Phone 4 and 3GS can now be officially unlocked and many other worldwide network as well. You will see No Service (in i OS 4.x, you will see one signal bar).
This ‘baseband’ is a tiny and unique independent computer system that runs inside your i Phone, it is separate to the main system that handles the applications (such as email and google maps) and it talks to the main part of the phone over an internal communications network.
My friend, Randy, bought a year-old, open-line i Phone from Hong Kong.
He was using it with a Globe SIM card in the Philippines.
When you are prompted for the bootloader files 39and 46in redsn0w , browse to the respective files saved on the desktop and click Next.
Now make sure your i Phone is connected to your PC/Mac and turn it off [Hold the power and slide to power off] and click Next.