Jailbreak iPhone 3G with iOS 4.0.2 using Redsn0w 0.9.5b5-5
Apple released iOS 4.0.2 for iPhones and iOS 3.2.2 for iPads, patching the PDF security exploit, by doing so it also 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 away from this update until jailbreaking tools are released.
Fortunately for iPhone 3G users, you could 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 that 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 sure that 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 is not a necessity for you, we would recommend un-check it as it makes iPhone 3G run very slow.
4. Please switch off your iPhone now and plug it into 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’ll be notified that RedSn0wis complete. Click the Finish button. When your iPhone finishes rebooting (5 minutes or so) it will 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 problem of the new ios 4.x slowing iPhone 3G down, there’s no confirmation that the ios 4..2 has fixed this. If you’re experiencing slow performance with your iPhone 3G in the new ios 4.x, switch off Spotlight by going to Settings- General -Home – Search Results, and shut off everything you don’t need.