After iOS 4.1 Beta firmware update for developers, Apple has released iOS 4.01 for end users. The newly released iOS 4.01 supports iPhone 3G, iPhone 3GS and iPhone 4.
You can download this update from iTunes or use direct download links of iOS 4.01. iOS 4.01 is just a minor update and doesn’t lock the old jailbreaking methods. The Redsn0w 0.9.5 Beta 5 works perfectly on the firmware.
You can use following guide to jailbreak your iPhone on iOS 4.01. Please note that the Redsn0w 0.9.5 Beta 5 only supports iPhone 3G, so don’t try it on other devices.
Guide to jailbreak iOS 4.01 with Redsn0w 0.9.5
Requirements:
- iTunes 9.2 – Download from Apple’s site
- iOS 4.01
- Redsn0w 0.9.5 Beta 5
Steps to follow:
1. Download all the files and software mentioned above in the requirements.
2. Open Redsn0w 0.9.5 on the desktop and browse the “iOS 4” firmware, not iOS 4.01.
3. Install Cydia.
4. Check whether your phone is OFF and Plugged in to proceed further in the process.
5. Put your iPhone in recovery mode.
6. Now, follow the screen instructions to continue iOS 4.01 jailbreak.
7. Wait for Redsn0w to complete the process. Once done, iPhone will reboot automatically. That’s it!
You have a jailbroken iPhone running on iOS 4.01 firmware.
Disclaimer: The guide is only for information purpose. You should follow these steps at your own risk.


yes and unlocking works perfect on 3g thanks
Does this work on iphone 3GS too or only 3g?? And if it does work on 3GS, can I still use ultrasn0w to unlock afterwards??
When i select IOS4 firmware it said… not valid?
Did anyone manage this with an 3GS
It won't work on iPhone 3GS.
did you still have MMS capability??
[...] those who are waiting for iOS 4.1 jailbreak, it will be out soon. I’ll keep you guys updated. **Join our Facebook Fan [...]