How To: Jailbreak iPhone 4, 3GS on iOS 4.1 with Limera1n - Then Unlock with Ultasnow

1st. Jailbreak iPhone 4, 3GS Bootrom on iOS 4.1 with Limera1n

Moments ago, we posted that Limera1n was released to jailbreak all iOS 4.1 devices forever. We promised with how-to guides and here we go, you can now use the step by step guide below to jailbreak iPhone 4 and iPhone 3GS using Limera1n on Windows only.
 

Here's the instructions to jailbreak iPhone 4, 3GS on iOS 4.1 using Limera1n, PLEASE read the important notes at the end of the post:
STEP 1: Download Limera1n for Windows from here.

STEP 2: Connect your iPhone to your PC via USB then launch Limera1n and hit “make it ra1n”

STEP 3: You will have to get your device into DFU mode by following the steps on the screen shown by Limera1n.

• You iPhone will now be placed in recovery mode.

• Press both the power and the home buttons.

• When Limera1n asks you to, release the power button.

• Your phone will now be in DFU mode

STEP 4: Now, Limera1n app should be shown on your iPhone's home screen. Limera1n will pwn your device forever now.

STEP 5: The jailbreak should be done now. Tap on the limera1n icon on your device and install Cydia.

IMPORTANT:

• You have to keep some points in your mind, first, Limera1n will not unlock your device (i.e. you will lose unlock if you upgraded to iOS 4.1 and used limera1n).
• Use our guide posted here to update iPhone 4 (ONLY) to iOS 4.1 while preserving your baseband then unlock it using Ultrasn0w.

2nd Unlock iPhone 4 on iOS 4.1 with Ultrasn0w

Have you jailbroken your iPhone 4 yet? Of course, yes! Geohot has released his Limera1n tool yesterday and it works with iPhone 4 very well (at least for me). If you have iPhone 4, you can upgrade to iOS 4.1 without updating the baseband then unlock it using Ultrasn0w. In case you already upgraded to iOS 4.1 while preserving your baseband, you will not be able to use this guide, just wait for a new Ultrasn0w update. How to upgrade to iOS 4.1 while preserving your baseband 01.59.00

STEP 1: Download TinyUmbrella latest version from here and iOS 4.1 for iPhone 4 from here.

STEP 2: Close iTunes & connect your iPhone 4 to your PC then launch TinyUmbrella and select “Run as administrator”. If you got a Windows Security Alert, check both boxes and click on “Allow Access”.

STEP 3: Hit “Start TSS Server”. While the TSS Server is running well, TinyUmbrella will kill iTunes.

 

STEP 4: Now launch iTunes and click on the iPhone icon at the left sidebar of iTunes then hold left “alt” button (“Shift” button on Windows) + Shift from the keyboard. Point it to the iPhone 4.1 firmware you already download.

STEP 5: iTunes will go in a bunch of steps to restore your device to iOS 4.1, it should give you error 1004 which indicates that the baseband is preserved successfully.

STEP 6: Get back to TinyUmbrella and hit “Kick Device Out of Recovery” to get your device out of Recovery Mode. let's unlock!

** How to unlock iPhone 4 on iOS 4.1 baseband 01.59.00 with Ultrasn0w **

STEP 7: First, you will need to jailbreak your device using Limera1n jailbreak tool from Geohot by following the step by step guide posted here.
STEP 8: After jailbreaking, open Cydia and touch on Manage >> Sources >> Edit and hit the Add button on the top. Type http://repo666.ultrasn0w.com then hit “Add Source”.

STEP 9: After installing the repo, go back to Cydia and search for Ultrasn0w, tap on it and it will be installed automatically.

Well done, now you got iPhone 4 totally jailbroken & unlocked on baseband 01.59.00, congrats.

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