Check for the existence of iPhone9,3 files. If they are missing, visit the software provider's official support page or GitHub repository to download the standalone updated loader packages.
If your flashing tool saved a corrupted configuration profile for the d101ap hardware profile, it will keep displaying the error even if you use a fresh firmware file. loader for iphone9 3d101ap not found updated
If your specific tool is dead or abandoned, switch to a more modern solution: Check for the existence of iPhone9,3 files