Some tools read iPhone9,3 but expect iPhone9,1 (the Intel modem variant). The loader database may have entries for the 3D100AP (iPhone9,1) but not the 3D101AP. Your tool says “not found better” because the existing loader is incompatible (not “better” or optimized).
Ensure you have downloaded the correct IPSW file for the iPhone 7. An IPSW for an iPhone 8 or iPhone X will not contain the files for iphone9. loader for iphone9 3d101ap not found better
If your specific iPhone 7 uses a different board configuration (e.g., d11ap or d20ap depending on if it is a Plus model or Qualcomm/Intel variants), the tool might be looking for 3d101ap while your device needs a different file. Some tools read iPhone9,3 but expect iPhone9,1 (the