Skip to main content
  1. Home
  2. Tablets
  3. Mobile
  4. Legacy Archives

Greenp0ison finally unleashes iOS 4.2.1 untethered jailbreak

Add as a preferred source on Google
Image used with permission by copyright holder

Have a jail broken phone? Make sure to check out our picks for the best jailbreak apps and games.

Jailbreaking one’s iDevice is an increasingly common practice as more users realize that any inherent dangers are made moot by Apple’s System Restore function. The advantages offered by jailbreaking are appealing, particularly with apps like MyWi, which turned your device into a Wi-Fi hotspot long before the functionality was announced as coming with the iOS 4.3 update. The latest version of Apple’s operating system, 4.2.1, was released back in November, but iDevice users have been kept waiting since then for a viable jailbreak method… until now.

Recommended Videos

Last night, Chronic Dev Team’s Joshua Hill took to his Twitter account with a brief message: “Go get it. www.greenpois0n.com.” The new version of greenp0ison, labeled “rc5” — release candidate 5 — is now up for download. Only the Mac version is currently available, but Hill promised in his Twitter feed that a Windows version is coming soon.

The new greenp0ison release is notable because it allows for an untethered jailbreak of your iDevice. Prior to rc5, iOS 4.2.1 could only be subjected to a tethered jailbreak, meaning that anytime the device needed a reboot it would first need to be connected — “tethered” — to a computer running the proper software. As anyone who uses the Cydia app store knows, installing a jailbreak app or applying updates to the same frequently requires just that sort of reboot. The latest greenp0ison release removes that requirement.

iPhone 4 users are currently being advised to steer clear of rc5 for now. This really only applies to those who wish to unlock their device however, as the jailbreak updates the device’s baseband firmware, making the use of a custom SIM card an impossibility. There also appear to be a few issues for some installing Cydia; users encountering this issue are advised to use redsn0w 0.9.7 post-jailbreak to get it installed and running. As the release is still now, updates are sure to come soon. Windows users are going to have to wait regardless, but Mac-folk who aren’t particularly savvy in the mobile tech department may want to also hold off on the jailbreak as well, until those initial launch issues are sorted out and a more stable option is available.

Regardless, after months of waiting, an untethered iOS 4.2.1 jailbreak is finally here. Good news for anyone who like to squeeze every last bit of functionality out of their iDevice.

Adam Rosenberg
Former Gaming/Movies Editor
Previously, Adam worked in the games press as a freelance writer and critic for a range of outlets, including Digital Trends…
The OLED iPad mini might miss the one upgrade fans wanted most
Home screen layout of the 2024 iPad mini.

If you've been holding off on buying an iPad mini because you were hoping Apple's first OLED model would finally get a smoother display, you may want to temper your expectations.

A prettier screen, but not necessarily a faster one

Read more
Huawei’s MatePad Air finally comes out of China and it makes the iPad Air feel inadequate
Huawei just showed what “Air” should include
Huawei MatePad Air being used with a stylus

Apple’s iPad Air remains one of the easiest tablets to recommend, largely thanks to its powerful M4 processor and excellent app ecosystem. Huawei’s latest MatePad Air has now left China, and its hardware makes Apple’s mid-range tablet look surprisingly under-equipped in some areas.

The 2026 Huawei MatePad Air will go on sale in select global markets on August 1. Prices start at 849 euros for an 8GB and 256GB model with the Smart Magnetic Keyboard included. A PaperMatte version with either the keyboard or M-Pencil Pro costs 899 euros, while the 12GB model reaches 999 euros. This arrives just days after Huawei unveiled the MatePad Pro.

Read more
Apple could launch two new Apple Pencils next spring alongside the iPad Pro
Bloomberg reports that two refreshed styluses are planned for next spring's iPad Pro launch
Apple Pencil featured

Apple's next iPad Pro refresh might not be the only hardware getting an upgrade. According to Bloomberg's Mark Gurman, Apple is preparing two new Apple Pencil models for launch next spring. The lineup is said to include a refreshed Apple Pencil Pro alongside an updated version of the more affordable USB-C Apple Pencil, with both expected to debut alongside the next-generation iPad Pro.

A refresh for both ends of the lineup

Read more