The error message typically occurs during the iOS firmware restoration or forensic extraction process. It indicates that the software application (usually a specialized tool like checkm8-based utilities, forensic software, or custom IDE tools) lacks the specific binary loader file required to communicate with the device's Secure Rom (ROM) or specific hardware revision.
Here, ipwnder is looking in /usr/share/ipwnder/loaders/ or a local ./loaders/ folder for a file named like 3d101ap.ibss or 3d101ap.img3 . loader for iphone9 3d101ap not found