Chronic Dev Team 推出了最新 RC5 版本的 GreenPois0n Jailbreak 工具，用家現在可以「完美」地 Jailbreak iOS 4.2.1 的 iPhone，iPad 或 iPod touch。有「完美」和「不完美」之分，是因為早前有些 iDevice Jailbreak 後重新開機就要再 JailBreak 一次，此版本的 GreenPois0n 就沒此問題了。
用家現在可以登上 GreenPois0n.com 下載 GreenPois0n RC5 工具（請確認下載的為 RC5），按照畫面指示就可以了。目前 GreenPois0n 只有 Mac 版本，相信其他平台的會相繼推出。不過，該網早前曾一度離線及顯示為舊版，假如下載不到，可到這裡找找其他的下載點。另外，部份用戶回報用此工具 Jailbreak 後有少量 bug出現，Jailbreak前最好先進行備份。
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Mirror: http://www.ez-concept.biz/greenpois0n-osx_rc5.zip
我已經jb完，但係cydia仲未download到。文中話會有少量bug,會係啲咩bug?
參考幾個網站的讀者回應，最多人是連JB也做不到，或者loader有問題。一如過往的 JB 工具，新推出時個別用戶可能會遇到不同的「奇難雜症」，很難一概而論。總之還是那句，記得備份。
iPad JB Failed
iPad failed.
iphone4 loader failed
失敗ed
people dont worry about this, GP RC5 will be released before IOS 4.3 is out because the eploit in 4.2.1 is already patched in 4.3 so there is no point delaying after 4.3.
JB完GP RC5後，開機按Loader，就只見白色屏幕，沒有load到Cydia出來，點算?
credit-howard1 (sinfuliphone)
PROBLEM 1: Stuck due to “Greenpois0n initialized” error.
SOLUTION: Simply just download “Greenpois0n RC5_2“
PROBLEM 2: While installing Cydia, Greenpois0n Loader crashed.
SOLUTION: The Greenpois0n Loader will only work when greenpois0n.com website will come online. The site is down because too many visitors tried to access it and the web server is unable to handle that amount of requests. It will be live very soon. Till that time you can follow below steps after jailbreaking using greenpois0n. You have to use Redsn0w to install Cydia after using Greenpois0n.
1. Switch off your iDevice and open Redsn0w 0.9.7b6.
2. The only option that should be checked is ‘Install Cydia’.
3. Follow the instructions to in Cydia and thats it.
PROBLEM 3: Using Greenpois0n to jailbreak iOS 4.2.1 results in the “FAILED” Error
SOLUTION:
1. You must use Greenpois0n RC5_2
2. Your iDevice must be connected to your MAC.
3. Open the TERMINAL, type in ‘cd Desktop’ (without quotes) and press Enter.
4. Now type in ‘open Greenpois0n.app/Contents/MacOS/greenpois0n’ (without quotes) and press Enter. It will result in a new window and Greenpois0n will be started.
5. Follow the self explanatory instructions to put your device in DFU mode. The jailbreak process will start.
6. After it is jailbroken, a greenpois0n Loader will be there now. This is to let you install Cydia.
If the loader is crashed or not appearing etc. Follow the steps below.
1. Switch off your iDevice and open Redsn0w 0.9.7b6.
2. The only option that should be checked is ‘Install Cydia’.
3. Follow the instructions to in Cydia and thats it.
PROBLEM 4: The screen of iDevice goes blank after jailbreaking. Still in DFU mode.
SOLUTION: You have to leave your device as it is for almost 2 minutes. Now press and keep on holding the home and power button simultaneously for almost 10 to 15 seconds until your device boots normally.
PROBLEM 5: Errors: Unable to find fs_mount, Unable to find fs_unmount ,Unable to find fs_load_file
SOLUTION: Properly connect your iDevice. You must have your device ‘Switched Off’ when you connect, otherwise these errors will come.
我上外國網站睇～ 跟本都冇話對應 iPad, 點解 Unwire 可以唔睇清楚就話對應文中果３樣 iDevices 嫁？
做野小心ｄ啦～ 搞ｘ左我成個幾鐘呀 PK~!!!
http://www.redmondpie.com/jailbreak-ios-4.2.1-untethered-iphone-ipad-ipod-touch-greenpois0n-rc5-how-to-guide/
支援所有 iOS 裝置iPad 也支援，請問閣下遇到甚麼問題 Jailbreak 不到呢?
windows version is out, i have a copy.
I jailbreak my ipad using greenpois0n rc_b2, encounter problem in jail-breaking process. it show jailbreak failed and the button Quit(Restart to retry). No Cydia icon is installed in the ipad. Anyone can help?
我jb完之後 禁loder download到一半 佢話我唔夠位down 但係我部野入面係空的
You should really control the responses here