hi i have been on various links which allow me to download firmware 6.1.2. The file is always named ***.ipsw. the problem i am getting is when the file is downloaded onto my pc it does not have an ipsw extension. but instead is saved as a .zip file.
i am in need of the ipsw extension so i can stitch it to a .shsh blob in order to update from my current firmware of 4.1.2