There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks
The .etlt model is encrypted onnx model. Please try to decode the .etlt model to .onnx model.
Refer to Access model before conversion to .tlt OR decode .tlt to .hdf5/.pb
Then you can use trtexec to generate tensorrt engine based on the onnx file.