I have the XB3-C-A2-UT-001 cell module, and I can't get the cell firmware update to complete in X-CTU. I am using the XBIB-CU-TH dev board and set to cell bypass mode, and it always gets stuck in the state "Waiting for modem port..." for a very long time (about 5 minutes per try), and after retrying 3 times it quits with error "Could not communicate with the cellular modem over USB". I tried reinstalling the cellular drivers from ublox and that did not help. I even tried another Xbee module and still had the same issue. I am wondering what else to try to get it to work.