It’s been a busy day for jailbreakers since Chronic Dev-Team has released greenpois0n RC5 which jailbreaks your iPhone 4/3GS, iPod touch or iPad on iOS 4.2.1 completely untethered and we recently published a step-by-step guide on how to do it. However, that is only suitable for those who do not rely on a software unlock (ultrasn0w) for using their iPhone on an unsupported carrier. Now until a pwnage tool comes out for this, folks at FSM have posted a nice and quick guide for iPhone 4 users to jailbreak on iOS 4.2.1without updating their baseband and preserving ultrasn0w unlock.
Before you proceed, please note:
- This procedure is for iPhone 4 ONLY!
- Make sure your iPhone 4’s current baseband (e.g 1.59.00) is supported by ultrasn0w 1.2. (you can check the list of supported basebands here)
Step 1:
Download and install TinyUmbrella from here .
Step 2:
Download the official iOS 4.2.1 firmware for iPhone 4 here.
Step 3:
Load TinyUmbrella and Start TSS Server. To make sure it’s running, check out the logs…
Step 4:
Start iTunes
Step 5:
Now Plug-in your iPhone 4.
Step 6:
Restore to official iOS 4.2.1 using the downloaded firmware
Step 7:
You will get an Error 1013. That’s totally normal.
Step 8:
Put your iPhone 4 in DFU mode and jailbreak it untethered using greenpois0n RC5 by following this step-by-step guide.
Enjoy!
IMPORTANT:
- Fixing issues with greenpois0n RC5 Untethered Jailbreak for iOS 4.2.1.
- How To Unlock iOS 4.2.1 On iPhone 3GS / 3G With Baseband Update To 06.15.00 Using PwnageTool 4.1.3 + Ultrasn0w 1.2 [Guide]
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