How To: Install, Activate, Jailbreak iPhone OS 4 IPSW

iPhone Dev Team delivers first OS 4.0 jailbreak, complete with activation instructions

Although Softpedia doesn’t encourage employing leaked, pre-release software, those who decide to proceed with carrying out these activities should at least ensure they do it right. Starting today, those with update-itchy fingers have everything they need to download, install, activate and jailbreak the latest iPhone software from Apple.

The iPhone OS 4 beta Cupertino spit out earlier this month has long been available for grabs from various download sources. However, the IPSW file is not usable without a properly registered developer UDID with Apple. From there on, those who want to jailbreak need to follow even more steps. Only the most knowledgeable developer types should attempt to do this, the infamous group of hackers known as the iPhone Dev Team says. They’ve just released an updated redsn0w for Mac OS X and have posted instructions on how to achieve a full jailbreak of the iPhone 4.0 beta IPSW.

First off, the Dev Team’s MuscleNerd stresses that this beta version of redsn0w only supports iPhone 3G, Mac OS X, and the current iPhone OS 4.0 Beta 1. Future releases from Apple may not work with the jailbreak tool in question. The hacker also points out that folks relying on carrier unlocks should not attempt to install OS 4.0, as they will update their baseband, possibly losing their chance of ever unlocking again. With this out of the way, here’s the set of instructions given by MuscleNerd, exactly as posted over at

How do I use it?

If you're a developer for jailbroken apps and you've already updated your iPhone3G to iPhone1,2_4.0_8A230m_Restore.ipsw, the next steps are:

1. Make sure you've already activated your iPhone3G with iTunes and your developer UDID

2. Launch the beta redsn0w 0.9.5

3. Select your stock iPhone1,2_4.0_8A230m_Restore.ipsw file (you've already used this to update your iPhone3G to 4.0beta1)

4. Select “Install Cydia” and click “Next.” Use DFU mode to install the jailbreak.

5. When your iPhone3G comes back up, you'll notice Cydia has a blank white icon […] You'll also notice Cydia has no sources. Go to the Sources panel and add this repo: (be sure you have a carrier or wifi signal first!). When Cydia restarts, you should see its real logo now, and the standard sources should be ready to use.

Softpedia notes

By doing a routine search on a popular torrent-search engine following Apple’s April 8 announcements, Softpedia found that a file called “iPhone2,1_4.0_8A230m_Restore(3gs)” was being made available for download, free of charge. The file is supposedly rendered iPhone 3G-compatible by the Dev Team’s newly updated redsn0w app. As far as activating the OS 4.0 beta is concerned, various scammy sites advertise themselves as being able to get the job done. Some make good on their promise, while others just snatch the five to ten bucks they charge and never deliver.

Softpedia doesn't encourage jailbreaking / unlocking the iPhone / iPod touch or any other device. This article has a purely informational purpose and doesn't, in any way, suggest that you should hack your Apple device. Using hacks may render your device unusable, or may reduce the quality of your experience employing the respective device. If you choose to download and install jailbreak tools, you will do so at your own risk. Unlocking / jailbreaking your iPhone / iPod touch may violate your warranty or the EULA with Apple and / or your cellular-service provider.

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