The error typically occurs when using GSM servicing software like UnlockTool or Broque Ramdisk Pro to execute a boot ramdisk exploit . This process is commonly used for bypassing iCloud or fixing disabled screens on Apple devices.
Before fixing the error, you must understand what your software is looking for. Apple does not use consumer-friendly names like "iPhone 7" or "iPhone 8" in its low-level firmware. Instead, it uses and Hardware Suffixes . loader for iphone9 3d101ap not found