Kindly check whether the USB-to-Serial converter works properly when connected to a host PC. Also, please try connecting it to a different USB port on the iWave development kit using the iWave-provided binaries and verify whether the issue persists.
For further product inquiries, please get in touch with our sales team at mktg@iwave-global.com
Please find the detailed product information here:
i.MX 8M Quad/QuadLite/Dual SMARC System On Module