If you are seeing this error, you can try the following steps to "reconnect" the loader: SOLVED: How to fix iTunes error 9 - iPad - iFixit 26 Jul 2012 —
(Only use third-party command-line tools if you understand risks; prefer official restore first.) loader for iphone9 2-d11ap not found
If it fails, use a dedicated boot tool (e.g., iKeyPrime) to boot the device into a ramdisk state first. 3. Check for Driver Issues If you are seeing this error, you can
What (macOS, Linux, Windows) is your computer running? If you are seeing this error