How to Use Greenpoison RC5 on Windows to Jailbreak iPhone, iPad and iPod Touch Devices

Here is the step by step guide for Windows users to apply untethered jailbreak on iOS 4.2.1 devices while using Greenpoison RC5. Greenpois0n Windows version jailbreaks all idevices except Apple TV2, which will supported in the next update.

It is to be noted that Greenpoison also available for Mac Users. The whole guide and steps are same as mentioned in this guide. If you are a Mac User, simple download the latest Greenpois0n RC5 on your Mac machine and follow the same guide to jailbreak your device.

There are four types of users right now who are interested to get untethered jailbroken state on their devices:

a) Users having idevices on iOS 4.2.1 but without previously jailbroken – You can try Greenpoison without restoring to fresh iOS 4.2.1.

b) Users having already jailbroken devices on iOS 4.2.1 with (Redsn0w) Monte technique – Please restore to fresh stock iOS 4.2.1 first before jailbreaking with Greenpoison.

c) Users having idevices which are jailbroken (tethered) with Redsn0w – You can also try Greenpoison without restoring to fresh iOS 4.2.1.

d) Those user who fall into any of above categories but also rely on unlock – You can give a try to Greenpoison without restore to get untethered jailbreak. In case you fail, please restore to custom iOS 4.2.1 cooked with PwnageTool while preserving the Baseband and then use Greenpois0n.

Here is the complete step by step guide to jailbreak iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G, iPod Touch 3G, iPod Touch 2G and iPad on iOS 4.2.1.

Step 1: Back up your iPhone / iPad / iPod touch using iTunes.

Step 2: Download Greenpois0n for Windows.

Step 3: If you need to restore/update your device to iOS 4.2.1, use the latest version of iTunes to do so. Those users who rely on unlock will have to put their devices into Pwned (limera1ned) DFU mode before restoring to custom iOS 4.2.1. They can use Redsn0w to get Pwned DFU mode.

Step 4: Close iTunes and launch Greenpoison.

Step 5: Click on the button “Prepare to Jailbreak (DFU)”

Step 6: Greenpois0n will display the instructions to put your device into DFU mode.

  • Press and hold the sleep button for 2 seconds
  • While holding Sleep button, press and hold Home button for 10 seconds
  • Release the Sleep button but continue holding Home button for 15 seconds

Step 7: Once your iPhone is in DFU mode, click the “Jailbreak” button.

Step 8: Greenpoison will now jailbreak your device.

Step 9 (i): After a successful jailbreak, your device will restart and you will notice a new “Loader” app in Springboard. Launch it and select Cydia to install it.

Step 9 (ii): If you are unable to install Cydia or you are on unsupported carrier and stuck at Emergency Mode, use Redsn0w to install Cydia and to hacktivate your device.

Enjoy jailbroken (untethered) device!

Update: An updated version of Greenpoison is now also available which includes iBooks fix. Read the post here for more details.

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40 Comments

  1. i am a type a. user i did not restore a fresh 4.2.1, i keep on getting
    Unable to find fs_mount
    Unable to find fs_unmount
    Unable to find fs_load_file
    greenpoison initialized
    on debug logs. i tried turning off properly and hold home button but no success. any help?

    Reply
    • I think you are not putting your device into DFU mode properly. Keep pressed the Home button for at lease 15 seconds.And wait for 5 minutes after you get the above mentioned error.If you still fail, you’ll have to restore a fresh iOS 4.2.1.

      Reply
    • I’ve made it worked. i waited the failed first run to complete. then i notice it created a kernel.release file then i retried then boom it works. maybe it just a coincidence but anyways thanks!

      Reply
  2. Do you lose your contacts after the JB?
    If yes, how can you backup them on a non-JB iOs 4.2.1?

    @ Greenpoison: great job!! Thanks in advance!!!

    Reply
    • You don’t lose your contacts if you back your phone up using iTunes. Please make it sure that you have synchronized your contacts properly with iTunes’ available options.

      Reply
  3. Thansk for the steps. It worked for me on update of iPad 3.2.2 to 4.2.1 and jailbreak of it on 4.2.1

    Reply
  4. Anyone tried this on an iPhone4 that was already jailbroken by redsnow? How did it go?

    Reply
  5. Thank you …it is working … iphone 4 , firmware ver 4.2.1, baseband 03.10.1 , jailbroken with redsnow RC8 ( tethered ) …. now I’m untethered … thanks again

    Reply
    • I have iphone4 4.2.1 bb3.10.1 can u tell me how u unlock ur iPhone
      , I jailbroke with greenposion already

      Reply
  6. how to restore 4.2.1 fresh again i have all ready 4.2.1 its dosn’t go on dfu mode its say try again i am confuse

    Reply
  7. Well worked fine on both Iphone 4 and 3gs both tethered using redsnow, got problem now only with wifi anyone else had same problem

    Reply
      • I have the same issue. Had it in 4.1 with limera1n too.

        Device will be on a WiFi network then will lose connection and won’t reconnect till either a respring or reboot takes place.

        Was definitely not happening before JB. I strangely suspect SBSettings

        Reply
    • What type of wifi problem are you having?
      Sometimes my ipod4g will time out trying to
      access something over wifi. If I reboot then
      it’s fine for awhile then does it again.

      Reply
  8. works great on my iPad 4.2.1 tethered with redsnow 0.9.6b4. no need to restore to official iOS 4.2.1 just jailbreak directly greenpoison

    Reply
  9. The instructions say to power off device and connect it. Does that mean it SHOULD NOT be connected when it is powered down?

    Reply
  10. Worked great on my itouch that was already rocking a tethered redsnow jb. Kept all my apps from cydia as well. Now I have an untethered jb.

    Reply
  11. the download link is a winws picture viewer file that is not working .
    PLEASE SOMEONE HELP !!!!!!

    Reply
  12. works great, if anyone thinks there are errors just try again and it will work.

    Reply
  13. Help i have an iphone 3g running on ios4.0 jailbroken, how to i install this jailbroken ios4.2, do i need to upgrade then jailbreak or what

    Reply
      • I have nearly the same problem. I have the app but it doesn’t run.
        and the Redsn0w webpage doesn’t go open…

        Reply
  14. IT WORKED!!!!!!!!! IT WORKED!!!!! REDSNOW DIDNT WORK BUT THIS DID!!!!!!!! IT WORKED!!!!!!!!!!!!!!! ))))))))))))

    Reply
  15. haha i had trouble getting to the dfu process. I selected the jailbreak for an apple tv so it went all wrong. aha after i figured that out everything went smoothly. Great jailbreak guys

    Reply
  16. my ipod is now jailbroken using greenpoison RC5.. my ipod is 3rd gen and 4.2.1 firmware.. now when i was installing the cydia from loader it stock and says “memory full” and when i click the cydia it wont work.. and when i try to install it again it says that ive already installed the cydia.. please help me on this one.. thanks and GODBLESS..

    Reply
    • Re-try after few hours. Otherwise use Redsn0w latest version while checking the “Install Cydia” option on the available features page of Redsn0w.

      Reply
      • i am using windows OS.. redsnow 0.9.7 b6 doesnt release for windows OS.. should i use the redsnow 0.9.6 rc8?

        Reply
  17. i jailbroke with this i have 3rd generation itouch. I restored it from device now its frozen on the apple thing when u turn it on…. NEED HELP!!!

    Reply
    • I cant jailbreak with green poison on my itouch 4g. it stops at the loading screen to install greenpoin with the small white lettering going about a 1/4 of the way down the screen.ive tried several times and it keeps doing the same thing. i was able to jailbreak it with redsnow easily but some addons in cydia only work with greenpoison.any suggestions?thanks

      Reply

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