Sometimes you need to save the SHSH signature of an iPhone, iPod or iPad, somehow this kind of operation requires a tool like TinyUmbrella. This is a software for saving SHSH signature of an iPod, iPhone or iPad on a Mac. This signature is unique and specific and for each device and "firmware". It enables to detect any changes that have been made on these devices. It can also restore the old "firmware" from this signature if a new one would not be satisfactory. It is easy to learn and to use.