Thanks for the feedback. I did try to erase and flash again using the CLI tools on a MacBook Pro running Mac OSX 10.14.6 and got the same results.
772 wio_flash_tools$ ./amebad_flash_tools erase --port /dev/cu.usbmodem14101
Erasing…
All images are sent successfully!
Image tool closed!
done!
773 wio_flash_tools$ ./amebad_flash_tools flash -d …/wio_rtl8720_firmware --port /dev/cu.usbmodem14101
copy img to workspace…
Flashing…
All images are sent successfully!
Image tool closed!
done!
774 wio_flash_tools$