Couldn't find a USB driver for the tablet but I got the problem fixed. For some reason the B4A bridge APK was corrupted on the sdcard (did a hash compare).
But I have a suggestion for B4A bridge - could you change the color of the grey line (bottom of activity) that changes to blue as compiled programs are transferred? That blue is not easy to see against the while background. How about red or orange?
Also, is it possible to extend the timeout for B4A before the download aborts/connection breaks? There are some times that I have to reconnect (F2 on PC side) and then download again (F5) because the grey line stops progress from grey to blue. Not sure if it is a poor wifi signal (have more than 2 bars).