For the PyInstaller issue, the failure is caused by the different versions between PyInstaller and JetPack.
PyInstaller uses v4.5.4 but JetPack 4.6 use 4.1.1 and triggers the error.
However, since JetPack 4.6.1 is just a minor update, the OpenCV version remains 4.1.1.
To get OpenCV v4.5.4, please try our JetPack 5.0.1 DP below instead: