How to Jailbreak iPhone 4 (1.59.00 Baseband) Untethered on 4.2.1 with GreenPois0n RC5 and Unlock with Ultrasn0w:
The following instructions will help iPhone 4 unlockers to update to iOS 4.2.1 while keeping the old 1.59.00 baseband, jailbreak it untethered with GreenPois0n RC5, and then unlock it with Ultrasn0w.
NOTE: This guide is meant for iPhone 4 only.
Step 1: Download the latest version of TinyUmbrella from here.
Step 2: Start TinyUmbrella, and then click on “Start TSS Server”.
Step 3: Start iTunes, Connect your iPhone 4 with your computer. Click on your iOS device icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac, or Left “Shift” button if you are on Windows on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.
Step 5: Now click on TinyUmbrella’s “Exit Recovery” button. Your device will now restart normally.
Step 6: Now follow our complete step by step guide posted here to jailbreak your iPhone 4 untethered on iOS 4.2.1 using GreenPois0n RC5.
Step 7: Once you have jailbroken your iPhone 4, you can safely unlock it on iOS 4.2.1 (on 01.59.00 baseband) using Ultrasn0w 1.2.
NOTE: This guide is meant for iPhone 4 only.
Step 1: Download the latest version of TinyUmbrella from here.
Step 2: Start TinyUmbrella, and then click on “Start TSS Server”.
Step 3: Start iTunes, Connect your iPhone 4 with your computer. Click on your iOS device icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac, or Left “Shift” button if you are on Windows on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.
Step 6: Now follow our complete step by step guide posted here to jailbreak your iPhone 4 untethered on iOS 4.2.1 using GreenPois0n RC5.
Step 7: Once you have jailbroken your iPhone 4, you can safely unlock it on iOS 4.2.1 (on 01.59.00 baseband) using Ultrasn0w 1.2.
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