Step 5: Ater sn0wbreeze identifies the iPSW file, click Next button. Step 4: If you have already downloaded iOS 5.1.1, browse to the location where you saved it or download the iPSW file. This is an optional step but it is better to save the iPSW on your local hard disk. Step 1: First of all download iOS 5.1.1 for iPhone 4 and iPhone 3GS. To accomplish the first part, we will use the latest version of Sn0wbreeze. Because we want to use a SIM from unofficial carrier, we will also hacktivate the firmware during this process. The first part of iOS 5.1.1 unlock for iPhone 3GS and iPhone 4 involves the installing of custom iOS 5.1.1 firmware having preserved baseband. Part One – Installing the Custom Firmware with Preserved Basedband on iPhone Note: This guide is not compatible with iPhone 4S because there is no tool available which can preserve the baseband of this phone. ![]() ![]()
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