@hanktttop I have the same problem, my cardputer arrived yesterday, a follow all sugestions on this post.
Then I ask on discord channel hackingtroop about the problem, and their sugesto to try another cable, It's works. But one point of attention, the LED don't work as expected, anyway the cardputer enter on download mode.
Hold BtnGO, plug in o cable, and burn firmware. With the new cable, just plug and MM5Burner show pop-up about device found.