
You can download greenpois0n from http://greenpois0n.com/
Read more details about greenpois0n RC5.
Read the guide: “How-to Jailbreak iOS 4.2.1 Untethered using GreenPois0n RC5“
From the category archives:

You can download greenpois0n from http://greenpois0n.com/
Read more details about greenpois0n RC5.
Read the guide: “How-to Jailbreak iOS 4.2.1 Untethered using GreenPois0n RC5“
As posted earlier that greenpois0n RC5 for Windows will be released soon within 1 – 2 day. You can download greenpois0n RC5_b2 for Windows today. greenpoison RC5 for Windows released Saturday night.

Direct download link for greenpois0n RC5_b2:
[click to continue…]

You can download greenpois0n from http://greenpois0n.com/
MIRROR: Download greenpois0n-osx_rc5_2.zip
Read more details about greenpois0n RC5.
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How-to Jailbreak iOS 4.2.1 by using GreenPois0n RC5
What is greenpois0n? It’s another jailbreak tool created by Chronic Dev-Team.
1. Download greenpois0n RC5 (RC5_2 is updated version)
2. Download iOS 4.2.1 IPSW File
3. Extract greenpois0n-osx_rc5_2.zip (greenpois0n-osx_rc5.zip is older version still buggy, greenpois0n-osx_rc5_2.zip is updated version).

4. Connect your iPhone to computer then turn it off while it still connected.
5. Run greenpois0n and click Jailbreak.

6. Get ready to start. greenpois0n will help you how-to enter DFU mode in three steps

7. Once iPhone enter DFU mode, greenpois0n will start jailbreak the iPhone automatically.

8. While greenpois0n jailbreaking the iPhone, do not either close greenpois0n nor disconnect the iPhone from computer. Your iPhone screen will be flooded by texts while greenpois0n is in action.

9. Once jailbreak complete, you will see “Complete!” button on greenpois0n.

Jailbreak is done.
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You can download greenpois0n from http://greenpois0n.com/
OR
You can download greenpois0n from Download greenpois0n RC5 Mac version from iPhoners.org as well (MIRROR).
If you have greenpois0n decompression issue, download greenpois0n from this mirror: Download greenpois0n without decompression error.
It’s currently only available for Mac, Windows version will be released soon. Be sure to subscribe or follow @iPhonersxOrg on Twitter to get instant updates.
It doesn’t support hacktivation, untethered jailbreak for iOS 4.2.1
Read more details about greenpois0n RC5.
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What‚Äôs greenpois0n? It’s another jailbreak tool created by Chronic Dev-Team.
Back when 3.x came out they were going to use it as an actual jailbreaking tool, but plans changed, blackra1n came out as well as spirit which by then Greenpois0n would have been a waste. So time went on and 4.x came out. Then boom!! jailbreakme 2.0 came out and you can have another jailbreak again, but when 4.1 arrived there was no jailbreak so the dev team started up the “jailbreak” version of Greenpois0n and was going to release it on 10/10/10.
GreenPois0n uses SHAtter exploit in order to jailbreak iDevices (iPhone, iPod, iPad).
GreenPois0n is untethered jailbreak. So, you won‚Äôt have any problem each time your iPhone reboots. GreenPois0n also supports hacktivation. So, If you got “The SIM card inserted in this iPhone does not appear to be supported” error due to iOS 4.1 update, you can fix it by using greenpois0n RC4 to jailbreak your iPhone.
Supported Devices:
According to the Chronic Dev Team, Greenpois0n will jailbreak iOS 4.1 on A4 processor + iOS based devices only. Which includes:
* iPhone 4
* iPod Touch 4G
* iPad
* Probably the AppleTV 2 as well. (Apple TV 2G is vulnerable to the SHAtter exploit)
For rest of the devices, Chronic Dev team says:
To clarify, the reason it does not work on non-A4 devices is not because we are lazy, but simply because it can’t be exploited on them.Chronic Dev-team’s twitter
Update: iPod Touch 2G (MC & non-MC models) is supported by greenpois0n RC4.
How-to jailbreak iOS 4.1 on iPhone 4, iPhone 3GS, or iPod touch by using GreenPois0n:
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