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Download GreenPois0n RC5 to Jailbreak iOS 4.2.1 [How to Guide]

04 Feb, 2011 by
iPhone, Tutorial

greenpois0n-rc5

The Chronic dev team has just released GreenPois0n RC5 jailbreaking tool which can be used to jailbreak iDevices running the latest iOS 4.2.1 firmware. Only catch here is that (for now) GreenPois0n RC5 is available only for Mac and it is not a stable release (RC5 – Release candidate 5). GreenPois0n for Windows and Linux is expected to arrive soon.

With GreenPois0n RC5, you will be able to jailbreak iOS 4.2.1 (untethered) on iPhone 4, iPhone 3GS, iPod Touch 4G/3G/2G, iPad and Apple TV 2G. Unlike Redsnow 0.9.7, Greenpois0n RC5 will not need any 4.2b3 SHSH Blobs saved on Cydia for Untethered Jailbreak.


Download GreenPois0n RC5

greenpois0n-rc5-download

You can download GreenPois0n RC5 from Greenpois0n RC5 or use this mirror. You can check the guide given below to use GreenPois0n RC5 to jailbreak iOS 4.2.1, but be aware of this being an unstable release and expect some problems if you don’t follow the procedure carefully.

Update: Greenpois0n RC5_2 has been released which fixes some of the previous issues. Download it here or here.

Update: GreenPois0n RC5 released for Windows. Download at greenpois0n.com or here.

How to Jailbreak iOS 4.2.1 using GreenPoisOn RC5?

Disclaimer: The guide is purely for informational and educational purposes only. Jailbreak your device at your own risk.

Do not proceed if you rely on carrier unlock. Ultrasn0w doesn’t support this baseband yet.

1. Download GreenPois0n RC5 from the links given above.

2. Connect your iDevice running iOS 4.2.1 to the USB of your mac.

3. Start GreenPois0n RC5 and click on Jailbreak button. Follow the on-screen instructions to put your device in the DFU mode.

4. Click again on Jailbreak button of Greenpois0n to start the jailbreaking process.

5. Wait for GreenPois0n to complete its steps. Once it’s complete, you will see a “Loader” icon on the springboard. Tap on it and install Cydia.

Voila! Your iDevice is now jailbroken with iOS 4.2.1! Thanks Blogsdna!

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Raju is the founder-editor of Technically Personal. A proud geek and an Internet freak, who is also a social networking enthusiast. You can follow him on Facebook and on Twitter. Mail Raju PP.
  • a$$ site

    theres not a windows version of rc5 as of yet you fuckin idiots..pretty obvious when you hit the dl button an it tries to save a rc4 file.

    • http://techpp.com Raju PP

      I normally mark these comments as spam, but approved it only to show other dimwits like you to read the post properly before hitting the download button. Right at the top, in the first paragraph, I have clearly mentioned that Greenpois0n RC5 is available for Mac only *sigh*

      • ;)

        good one raju ;)

  • George

    OK just a quick question. “rely on carrier unlock” ???

    i got an imei unlock from the spanish carrier the phone was on! itunes gave me the “congratulations u r unlocked” screen!

    Do i rely on a carrier unlock or this is for those who has a software unlock on a carrier locked phone?

    Sorry for my newbedity! ;)

    • http://techpp.com Raju PP

      So you mean to say you got your iPhone unlocked legally from your Spanish carrier? In that case you are safe, since updating baseband will not affect you.

  • George

    oh! I am currently on a :

    3gs 32gb New bootrom
    Got imei unlock from carrier
    FW 4.2.1 (8c148a)
    Baseband : 05.15.04

    Thanx again! ;)

    • http://techpp.com Raju PP

      As I mentioned in my previous comment, the restriction is for those who have used Ultrasn0w or other similar unlocking tools before.

  • Mr.C:WINDOWS\SYSTEM32

    when is the windows version coming out?????
    _______________________________________________________
    Windows XP SP3
    iPod Touch 4G 4.2.1 Currently Unjailbroken :(

    • http://techpp.com Raju PP

      Nice name!
      *pretty soon* is the answer for your query. We will surely update this post (or come out with new one) as soon as that happens. So stay tuned!

  • nick

    hello. i have a iphone 4 4.4.1 baseband 02.10.4 . if iwill use the rc5 i will jailbrek it only ? cos i need to unlock carrier. so this is going to make it for me? if yes i will update it to 4.2.1 . cos now iam in 4.1 as isaid before ith baseband 02.10.4 . in fact i have allready jailbrek it with limesnow but its still lock. so i need to unlock my sim. wat you suggest? thanks

  • Mouri

    Can I use this Jailbreak with iPhone 3GS new boot ROM? It is currently has tethered jailbreak and it is unlocked using Ultrasn0w. However, the baseband is 06.15.00. Any advice?

  • Ryan

    I am currently using a 3G with a 4.2.1 Custom Firmware. Whenever I try to use GP RC5, it makes the USB connect sound around 8 seconds left and then counts down to zero and tells me to try again. What am I doing wrong?

  • http://hmmbiz.com hardik

    dear sir, i bought iphone 4 locked with baseband 3.10.01, how do i unlock it ?

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