1. Once your device has the baseband 06.15, there is no solution to go back or downgrade the baseband. If Apple realizes this during a service change for example, you will lose your warranty.
2. You will no longer be able to upgrade your baseband in future versions of the iPhone 05.xx.xx sequence.
3. Once you are in 4.2.1 with baseband 06.15, you will no longer be able to restore the original Apple firmware, this will cause an error. You will still need to restore with your custom firmware.
The tutorial is only valid for MAC users, a version of redsn0w for Windows is available HERE
As promised, MuscleNerd, member of the dev team, has released the latest version of UltraSn0w for basebands higher than 05.13.04, namely the basebands of firmwares 4.1 and 4.2.1 😉
However, the software is only available for iPhone 3G / 3GS.
In the rest of the article, we offer a mini tutorial allowing you to install ultraSn0w and thus unlock your iPhone 3G or 3GS only.
The iPhone 4 version is coming soon…
Tutorial – Part I
1. Download PwnageTool 4.1.3 Unlock Edition
2. Launch PwnageTool, indicate firmware 4.1 corresponding to your device.
3. A window will then ask you if you are sure you want to update your baseband with that of the iPad. (No panic it’s normal, the dev-team uses the ipad baseband to unlock that of your iPhone 3G / 3GS)
4. Download iPad firmware 3.2.2 here
5. Indicate the firmware 3.2.2
6. Generate custom firmware
7. Restore with custom firmware
Tutorial – Part II
Launch Cydia and add the following repository:
http://repo666.ultrasn0w.com/ (attention, ultrasn0w is written with a ZERO, not an “O” (the letter))
Normally, going to the source, you should find the Ultrasn0w package:
Just install the package and restart your iPhone.
Normally, you should be able to insert any SIM card without any restrictions 😉
This unlocking is not of the same type as that of the operators:
- in no case should you restore your iPhone to a firmware higher than 4.2.1, in which case you will no longer be able to use UltraSn0w.
- At each restoration, you will have to reinstall Ultrasn0w (as long as it remains compatible with your baseband!)
Thank you to the many reports by PUSH, and also to the excellent work of MuscleNerd!