I didn't recognize any text using your demo

[Slhaos7373]

Is it unusable? Identified without any results

List<List>? results = await mrzDetector.recognizeByBuffer(
byteData.buffer.asUint8List(),
image.width,
image.height,
byteData.lengthInBytes ~/ image.height,
ImagePixelFormat.IPF_BINARYINVERTED.index);

[Slhaos7373]

  results = await mrzDetector.recognizeByFile(photo.path);

Still unable to use

[yushulx]

@Slhaos7373 Would you mind sharing your photo? Do you have a valid license key?