: The "2-n61ap" identifier refers to the iPhone 7's board config. Double-check that you haven't selected the "Generic" option if a specific config for your iOS version is available. Use 3uTools : If the tool still fails to connect, open Toolbox > iTunes Utility > Repair Drivers to ensure the PC sees the device correctly while in DFU.
To resolve the "Loader... Not Found" error, UnlockTool typically relies on the following feature: Loader For Iphone7 2-n61ap Not Found Unlocktool