I purchased RTK Base – Rover Calibrated Surveyor Kit believing I would use USB to attach to my tablet. APGLOS app is not seeing the USB connection. So I ordered Shield for second Plugin Socket and Bluetooth module. I uploaded the USB configuration file. When I do this it changes the baud to 38400 and base correction quits working. I tried to change the base to 38400 baud and that did not correct the issue. How do I use base station and bluetooth?