Jailbreak tool GreenPois0n RC5 for iPhone 4, iPhone 3Gs, iPod touch and iPad on iOS 4.2.1 is now available to download for Windows users. GreenPois0n Rc5 supports untethered iOS 4.2.1 jailbreak without iOS 4.2b3 SHSH blobs on Cydia server. Jailbreaking your iDevice allow third party applications installation which are restricted on Apple App Store. We have a step by step tutorial and also a Video guide on how to jailbreak iOS 4.2.1 using GreenPois0n Rc5 for Windows.
iPhone 4 users! if you are on an older iOS version than iOS 4.2.1 with Carrier Unlocked, Follow this guide on how to preserve unlock and upgrade to iOS 4.2.1 (only for iPhone 4 users)
How to Jailbreak iOS 4.2.1 with GreenPois0n RC5
Warning: Do not upgrade to iOS 4.2.1 if you relay on an unlock. Ultrasn0w does not support the latest baseband yet.
Step 1:
Download GreenPois0n RC5 from the following url http://www.greenpois0n.com Click on Windows link to download. If that link is not working for you download from this Mirror.
Step 2:
Save the zip file on your desktop.
Step 3:
Extract by double click the downloaded gp_win_rc5_b2.zip file then drag the greenpois0n.exe file to the desktop. Double greenpois0n.exe to launch the application.
Step 4:
Power off and connect your iPhone, iPod touch or iPad with the PC. Now Click the large Prepare to Jailbreak (DFU) button
Step 5:
GreenPois0n will instruct you to put your device into DFU mode.
Press and hold the sleep button (the power on button) for 2 seconds.
Continue holding Sleep button and also Press and hold Home for 10 seconds.
Release Sleep button but continue holding Home for 15 seconds.
Step 6:
Now your device is in DFU mode. Click the Jailbreak button.
Step 7:
Greenpois0n will now jailbreak your device
Step 8:
Click the Quit button once the Jailbreaking is completed.
You’ll notice some verbose mode text scrolling on your device.
Step 9:
After restart you’ll notice a new Loader application on your Springboard. Touch its icon and launch it.
Step 10:
Touch on Cydia then press the large Install Cydia button that appears.
Step 11:
Once Cydia has installed successfully you can remove Loader by pressing the Options button then the large red Remove Loader.app button.
Step 12:
Restart your device then run Cydia. Let it do all the necessary updates.
Congratulations, you have a jailbroken iOS 4.2.1 device.
If you faced any problems, you can follow the video guide by DinoD7 below.
How to Jailbreak iOS 4.2.1 using GreenPois0n RC5 (Video Guide)
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After jailbreak it was good for a day and today i try to open cydia it go blank and it go to recovery mode ,and i try and try ,it won’t even let me restore ,and just error message ,is my iphone 3gs dead ,any one had this happen and got fix, plz help
mine did the same!it brickjed and now its basicly apaper weight!!!!!!!!:’(
@ijo, i had this problem with redsnow. I discharged bettery complitly then started again restore in itune and it worked. (To discharg i left my phone for week in drawer) Then jailbreak using greenpoison
Best luck
Thx Dipak I will try that ,cause i went to the Apple store and they want $200 to replace my iphone 3gs,cause the error message i got from the itune is error 28,i did jailbreak 2 itouch and they work great ,so error 28 is problem with the battery,and i did have the battery replace by Apple store 3 months ago??
I went through the whole process & it seemed to be fine.. Until all those little white words popped up on my screen.. It said it was unable to find the Jailbreak? I did everything the site & video told me to.. Anyone know what’s wrong? Because I’m getting really upset with it. Thanks.
It Wont Let Me On Greenpois0n it said jailbreak failed
what does he mean about the base thing for iphone 4 as mine wont work
i have 4.2.1
Does Greenpois0n work on a 2nd gen iPod touch?
yeahh just did it,, it just takes a bit longer to start up the first time so dont panic
hey everything worked until i got to the point where i needed to open the loader app and it just wont open…. can anyone help!?
I have followed all these steps, and the loader icon has been installed on my iPod touch, but it is a blank icon and does not do anything when I click on it. Please help.
Same happened with my ipod the loader is just a blank icon and nothing happens when i click on it reply plz and answer
look, when you press jailbreak hold the home button still..DO NOT LET GO OF THE HOME BUTTON UNTIL THE GREEN BAR IS MOVING.
I have too followed all these steps, and the loader icon hasn’t been installed on my iPhone 3gs,Why? Please help.
Did i need to do any step in there??
Can u only use a windows computer to download it or can u download green poison on aplle mac book pro pls comment!
If you jailbreak your phone cant you just restore it from itune and itll go back to its original settings like an normal iphone?
so after i download green poison, can i straight away download apps from the app store or do i wait?
it won’t work. it says hold the menu and pause/play button. not sure what this is. any clues need help
i did everything and and everything worked but my iphone screen went completely white and i dont know what to do.. please help
I just followed the steps and it worked perfectly!
Thanks
I also followed the steps and oh my goodness its brilliant. Cheers guys!
Can you plz help me with ur BB? Im on 3.10.01 and using 4.2.1. But this does not seem to work! Am I missing something?
Thanks in advance!
I followed all steps even did my boyfriends phone. Works great Thanks!!!
Hello there,
It didn’t work with me, I have iPhone4 V. 4.2.1 (8C148)
does this work with the version I have?
Regards,
Majdi
can you get songs from itunes straight away?
Hy everybody.I have iphone 3G with 4.2.1,and i wanna jailbreak this phone for Greenpois0n RC5.I follow this easy steppes to the DFU mode…but,every time the program put out : TRY AGAIN.But my iphone is in DFU mode(according to itunes).Pls,help me:)
have u tried just waiting 30 seconds before you push try again
I have an i4 on 4.2.1 worked great…. pretty fast too. Now I just need to figure out how to unlock this thing.
I have followed all these steps, and the loader icon has been installed on my iPhone 4, but it is a blank icon (loader) and does not do anything when I click on it. help me!!!!.
how can u jailbreak it if the sleep button dosnt work?
i did everything then when i tried to download cydia is said error not enough memory space. now cydia isnt fully installed how do i delete cydia without restoring
I used it to jailbreak my phone and vital icons like the talk button, message button, and app store have disappeared all together. all the icons that come pre-packaged with the phone have been erased.
when i open cydia, it just says “initializing fielsystem” and then goes back to lock screen