The tool you are using doesn't have the specific bootloader files for your exact hardware revision. Corrupt Firmware:
If using developer tools, the specific iOS version support files for the iPhone 7 (iPhone9,3) may not be installed. loader for iphone9 3d101ap not found
After conducting research, the following possible causes have been identified: The tool you are using doesn't have the
: Sometimes third-party antivirus or firewalls block the computer from downloading the necessary firmware "loader" from Apple's servers. loader for iphone9 3d101ap not found