For all iPhone unlockers on iOS 5, we bring good news! iPhone Dev-Team has just released a critical update to their infamous ultrasn0w iPhone unlock daemon, bringing compatibility for iOS 5 devices – a mere two days after the official release of the OS. Hit the jump to read more about ultrasn0w 1.2.4 and its supported basebands.
Ultrasn0w 1.2.4 does not add support for any new basebands; it just adds compatibility for the daemon to be used with jailbroken iPhone 3GS and iPhone 4 running iOS 5. Basebands currently supported include:
For iPhone 3GS
For iPhone 4
The only way you can get iOS 5 on either of these devices while preserving the baseband is to use a custom IPSW for upgrade. redsn0w for Mac has been updated to support creation of a custom IPSW (unlike sn0wbreeze, it will only prevent the baseband from upgrading), while a Windows update is in works and might be hitting the web pretty soon. We may also remind you that all iOS 5 jailbreaks available at present are tethered; the only exception being iPhone 3GS on old bootrom.
Ultrasn0w is, by far, the easiest unlock solution available for iPhone. All you need is to install the package from Cydia on your jailbroken device and you’re good to go. It’s useful to note that ultrasn0w supports only certain basebands, so make sure you are on a version that is supported. You can check your iPhone’s baseband version under Settings > General > About > Modem Firmware.
Note: As with any tweak, use it at your own risk. While ultrasn0w has been proved safe by millions of users over time, we cannot be held responsible for any damage to your device.