, please note that Apple stopped signing this specific version on March 31, 2020. This means you can no longer officially restore or downgrade your device to iOS 13.3.1 using iTunes or Finder.
: Provides a direct link to the iOS 13.3.1 IPSW file for the Go to product viewer dialog for this item. Download iOS 13.3.1 for iPhone 6s model iPhone8...
: Offers a list of IPSW links for all compatible devices from its release in January 2020. , please note that Apple stopped signing this