Below are the direct links for the ios firmware updates that have been released for the iphone by apple so far. if you’re not sure which firmware file to download for your iphone, then check the post which will help you identify which firmware file to download based on your iphone’s model.. Ios (iphone/ipad/ipod firmware) is a collection of firmware update files (ipsws) for apple's popular ipod and iphone devices. the ipsw files provide a very quick method for updating the software on your ios device via itunes.. Ios 9.3.5. ios 9.3.5 provides an important security update for your iphone or ipad and is recommended for all users. for information on the security content of apple software updates, please visit this website:.