Dev-Team has released Ultrasn0w 1.2.4 to unlock the iPhone 4 and iPhone 3GS running iOS 5.0. The following guide tells you how to get this done.NOTE - Your device will need to have one of the compatible basebands in order to unlock using ultrasn0w.
To check your baseband go to
- Settings > General > About
- Scroll down to iPhone Baseband version under Modem Firmware
The following basebands are supported
- iPhone 4 - 1.59.00
- iPhone 3GS - 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00 (iPad baseband)
STEP 01 - Preserve your iPhone 4 baseband and update to iOS 5
- Run Redsn0w
- Select Extras and Select Custom IPSW button
- Browse and select the iOS 4 IPSW file you downloaded before
- Redsn0w will create a custom IPSW file without updating the baseband
- Once done it will show you the name and location of the custom IPSW file.
- Enter Pwnd DFU mode
- Select Extras and Select Pwned DFU button
- Follow the on screen instruction to but your device in DFU mode
- Open iTunes and it will tell you that your phone is in recovery mode
- Install custom Firmware
- Hold Shift (Windows) or Alt (Mac) and Select Restore in iTunes
- Browse and select the custom firmware redsn0w created.
STEP 02 - Jailbreak iOS 5
- You can read our guide to jailbreak your iPhone 4 on iOS 5 using Redsn0w here.
STEP 03 - Unlock iOS 5 with Ultrasn0w
- Open Cydia
- Select manage
- Under Sources Select Edit and then Add
- Add repo666.ultrasn0w.com in the pop-up window which opens
- Now Search for Ultrasnow and install version 1.2.4
- Once installation is complete reboot your device.