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Apple released iOS 4.0.2 for iPhone and iOS 3.2.2 for iPad, patching the PDF security exploit, this blocks browser-based jailbreaking by visiting JailbreakMe.com. For iPhone 3GS and 4G users, in case you are relying on jailbreaking and carrier unlocking, stay clear of this update until jailbreaking tools are released.

Fortunately for iPhone 3G users, you can still jailbreak iPhone 3G iOS 4.0.2 using redsn0w by pointing to the older iOS 4.0 firmware ipsw file, here’s how.

0. Download the official iOS 4.0 firmware ipsw file for iPhone 3G, iTunes v9.2, and redsn0w .9.5b5-5.

1. make sure iTunes v9.2 is installed, because redsn0w will depend on it.

2. Run redsn0w, click Browse and select the 4.0 ipsw file, Click Next.

3. Select your jailbreak options. Make certain Install Cydia is selected; the other ones are optional. Verbose boot displays detailed boot information is generally preferred by developers and advanced users.

Tip: RedSn0w selected Enable Multitasking by default. If multi-tasking isn’t necessary for you, we’d recommend un-check it as it makes iPhone 3G run very slow.

4. Please turn off your iPhone now and connect it to the computer, then click Next.

5. Follow the on-screen instruction to get into DFU mode.

6. Redsn0w will now handle the jailbreak process, once it’s complete you will be notified that RedSn0wis complete. Click the Finish button. When your iPhone finishes rebooting (5 minutes or so) it’ll be jailbroken.

That’s it.

Other Tips

1. For unlock users, update your ultrasn0w to v1.1-1 to save battery, as iPhone Dev Team announced in Twitter:

“ultrasn0w upgraded to version 1.1-1 we’ve tweaked a few things that may help with standby battery life, you can upgrade via Cydia.

2. Although Apple has promised to investigating the matter of the new ios4.x slowing iPhone 3G down, there is no confirmation that the new ios4..2 has fixed this. If you are experiencing slow performance with your iPhone 3G in the ios 4.x, turn off Spotlight by going to Settings- General -Home – Search Results, and turn off everything you don’t need.

Accompanied by Apple’s official release of iPhone iOS4, the iPhone Dev Team launched UltraSn0w 0.93 to unlock iPhone iOS4 with baseband 05.13.04, which also unlocks all basebands since iPhone OS 3.0. In essence, now all iPhone 3G and 3GS can be unlocked after being jailbroken first.

Since the programs here are still in their beta stage, we still highly recommend you wait for Dev Team’s stable releases, particularly if you want to use PwnageTool to safeguard your baseband to have an extra cushion.

But if you simply just cannot wait any longer, you really don’t lose that much, since iOS4 can be both jailbroken and unlocked anyway.

So here we go.

How to unlock iPhone iOS4 with baseband 05.13.04

1. Download the official iOS4 firmwares, iTunes v9.2, and redsn0w 0.9.5b5.

2. Install iTunes v9.2 and back up your iPhone.

3. Jailbreak your iOS4 with redsn0w 0.95.

4. Launch Cydia from your iPhone home screen.

5. Go to “Manage -> Sources -> Edit -> Add”, and please enter http://repo666.ultrasn0w.com, and then press “Add Source”. That last “0” in “ultrasn0w” is actually the number zero “0”. If you use the letter “o” you’ll get an error.

6. T-Mobile USA users should disable 3G before using ultrasn0w.

7. Then search for ‘ultrasn0w’ in Cydia and install ultrasn0w. Install it and restart your iPhone.

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