IPhone/iPad error (4013/Stuck in Process) solution required

General information for the business: --- Extra notes: Required remote help for iPhone 5s and iPad4 errors For iPhone 5s: Have tried to upgrade using iTunes to IOS 10.3,2 but at after restart it sticks in recovery mode and gives following error "The Iphone "Iphone" could not be restored.An unknown error occured(4013)." https://support.apple.com/en-us/HT201444 For iPad4: When upgrade to latest IOS version using iTunes it shows itunes screen but hangs there and do not go ahead of that! Any one who can install/Downgrade IOS or any Operating system to use these devices will be helpful. Looking quick solution