Unlock iPhone 3.1.3, baseband 5.08.01

My iPhone was a locked one with 3.1.3 upgrade. I jailbroke it using redsn0w-0.9.4(windows). There is a trick at this step while start cracking firmware 3.1.3, you need to point 3.1.2(iPhone1,2_3.1.2_7D11_Restore.ipsw) firmware path to break 3.1.3(iPhone1,2_3.1.3_7E18_Restore.ipsw) while selecting firmware on first screen of redsn0w. This works just perfectly.
STEP 1: Jailbreak your iPhone 3.1.3 using redsn0w, and make sure you select ‘Cydia‘ it needs to be therein for installing some utilities to determine, upgrade/downgrade and unlock purposes later.
STEP 2: Install Cydia/Terminal in your iPhone and check version of your baseband firmware, you need to use BBUpdateExtreme for this. It is a bit techie but prefect utility for checking baseband version, it showed different but correct info to me than other options I tried. It involves quite a long procedure so please refer to iPhoneHeat for this. You are lucky if it shows ICE2_BOOT_05.08_G2M3B2 to you, as it’ll increase your chances for unlocking your iPhone 3G to almost sure.
STEP 3: Now go to Cydia on your iPhone and Search for Fuzzyband and then install this application. Start fuzzyband and hit downgrade button to make your bootloader compatible for unlock/ultrasn0w. You are lucky if you see successfully downgraded message.
STEP 4: Almost done, now quickly install ultrasn0w and run it……………………DONE!Get to know the crack as soon as my friend posts it!

Please read the complete post on Navdeep’s Blog “Let us talk!!!”  Success to unlock my iPhone with FW3.1.3/BB5.12.01

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