The update supports iOS versions up to iOS 5.0.1. However,it`s not yet compatible with A5 devices. So, if you have an A4 device and an access to a Windows computer,then hurry up and download the latest iFaith version.
Since Apple has started signing SHSH blobs differently in iOS 5 than it did in previous versions, disabling users from replaying them during a firmware restore, It has become impossible to downgrade in iOS 5.
What`s really great about this iFaith version is not just that it saves SHSH blobs, but it also saves the accompanying AP ticket, making downgrading theoretically possible (to a custom IPSW).
According to iH8sn0w says that this updates brings some bug fixes, blob-dumping ism uch faster now.