Hello, Im running iphone 5s with 8.3 os on it want to upgrade to 8.4.1, I have my reason why I don't 9.3 OS. now I have downloaded the IOS 8.4.1 zip file open it and there is a DMG file there which is password protected. Can not find anywhere the password and cant find anywhere the IPSW file to upgrade my phone,. Try to change the dmg ext to IPSW did not help. Does anyone know where I can download IPSW file only not zip nor DMG. all linked I found coming from the same source appldnld.apple.com which have does not include the IPSW instead you have a password protected DMG file.