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The iPhone Dev-Team is back! They have just released a test version of redsn0w 0.9.5 (Mac only for now) to jailbreak the latest iPhone OS 4 Beta. This release is targeted towards developers only to help them upgrade their existing app on Cydia for this upcoming latest firmware.

redsn0w 0.9.5

Note: This release WILL NOT help you hacktivate or unlock your phone. You’ll need a registered UDID with Apple to get past the activation process. Therefore, DO NOT update to iPhone OS 4 Beta if you rely on an unlock, as upgrading will upgrade your baseband which will leave you locked.

The following step by step guide will help you jailbreak your iPhone 3G ONLY (for now) on iPhone OS 4 Beta.

Step 1: Download iPhone OS 4 Beta for iPhone 3G.

Step 2: Update to this latest firmware file: iPhone1,2_4.0_8A230m_Restore.ipsw

Step 3: Start redsn0w 0.9.5 and point it to the original iPhone OS 4 Beta firmware for iPhone 3G to proceed.

Jailbreak iPhone OS 4

Step 4: Now select “Install Cydia” and click “Next”.

Jailbreak iPhone 4.0

Step 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

Step 6: Connect your device in recovery mode by pressing the Power and buttons continuously.

Jailbreak iPhone 4.0 Beta

At this stage you will be presented with a screen where you will have to quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Step 7: Sit back and enjoy while redsn0w will do all the rest for you. Once done, your iPhone 3G will restart automatically and you will find it jailbroken with iPhone firmware version 4.0.

You will now notice that Cydia has a blank white icon. You’ll also notice that Cydia has no sources. Go to the Sources panel and add http://apt.saurik.com/cydia-3.7 repo. Now restart your phone and you should see the regular standard Cydia logo now.

How-to Enable Multitasking:

Once done, you can now enable multitasking on iPhone 3G, OS 4 by simply editing a N82AP.plist file as mentioned here. Open the said .plist file and change the multitasking key to = TRUE. If the is not there, add it and you’ll be done.

How-to Enable Wallpapers:

You can now enable support for Wallpapers on iPhone 3G and iPod touch 2G on OS 4 by following the step by step guide posted here.

For iPhone 3.1.3 firmware, you can follow our complete jailbreaking guide for iPhone 2G, 3G, 3GS and iPod touch 1G/2G using redsn0w 0.9.3, redsn0w 0.9.4, sn0wbreeze, PwnageTool 3.1.5. Unlocking can be done using ultrasn0w or blacksn0w.

For iPhone 3.1.2 firmware, you can use blackra1n, PwnageTool, redsn0w, sn0wbreeze, ultrasn0w and blacksn0w to jailbreak and unlock your iPhone and iPod touch.

Disclaimer: This guide is for testing & educational purposes only. I’m not responsible for any loss of important data or malfunctioning of your iPhone.

Download iTunes 9.1 for Windows and Mac
Download the Original iPhone OS 4 Beta for iPhone 3G
Download redsn0w 0.9.5 for Mac [Fast Mirror link]

UPDATE 1: iPhone 3G with 05.08 Bootloader can be unlocked using ultrasn0w if the baseband is downgraded to 04.26.08 from 05.13.03 using Fuzzyband. Step by step guide can be found here.

UPDATE 2: Redsn0w 0.9.5b2 Brings SMS and Data Issues Fix for iPhone OS 4 Beta Jailbreak. Download it from here.

UPDATE 3: Apple has just released Beta 2 of iPhone OS 4. Download iPhone OS 4.0 Beta 2 from here.

UPDATE 4: This guide is valid for iOS 4 final release, on iPhone 3G (any baseband) and iPod touch 2G using Redsn0w 0.9.5b5-2. Download Redsn0w 0.9.5b5-2 for Windows and Mac to jailbreak iPhone 3G and iPod touch 2G. You can unlock it (including 05.13.04 and 05.12.01 basebands) using Ultrasn0w 0.93 guide posted here.

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[Thanks Sandip for the hat tip!]

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