When you restore an iPhone via iTunes or Finder, you are flashing an IPSW file. Official IPSW files are signed by Apple; once Apple stops signing a particular iOS version, you cannot install it.
This can bypass the lock screen to let you use the device, but it often disables cellular services, iMessage, and iCloud syncing. unlock hub iphone 7 plus custom ipsw download
Instead of chasing a phantom custom IPSW, use one of these proven methods. When you restore an iPhone via iTunes or
The software then "flashes" the device, which supposedly replaces the original system files with a modified version that lacks the Activation Lock . but it often disables cellular services