We’ve recently reported that exploits can be applied to the baseband bootloader 5.8 to install any bootloader. Now a working exploit has been released via Cydia.

As we have not tested this program we strongly recommend not to try this for two reasons: first it seems this package is in violation of Apple’s copyright, as it distributes a bootloader and second the script seems to have issues. In quite a few cases downgrading did not work, although everything seems to have applied properly. Don’t use untested exploits. Sideeffects and damaged basebands might be the result.