How to securely Update iPhone 3G to 2.2.1 without messing up the Baseband for Unlock [yellowsn0w]

Go ahead and follow this if you have a jailbroken iPhone 3G (Firmware below 2.2.1) and don’t want to mess around with the unlocking tools for 2.2.1 firmware. Follow the following steps for both Windows and Mac Operating systems : 1) 2.2.1 Firmware from Apple iPhone 3G updates the baseband to 2.30 disabling the software…