XBee 3 LTE-M cell firmware update fails

Question

Hi,

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.

Answer 1

It turns out that the 2nd USB cable was somehow bad- I tried with a different cable and it worked.

Answer 2

Are you connecting the Micro USB cable to the board and PC as well or just the main USB cable?

Comments

I have both cables plugged in

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Check the two switches by the Micro USB port and make sure they are set to facing the edge of the board.

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Yes they have always been set to the edge of the board and it still does not work

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What I would suggest is contacting Digi Support at tech.support@digi.com

Answer 3

Try these steps:
- Slide switches left towards board end or I2C bus is disconnected in custom hardware.

- Ensure both USB's are connected to computer and device manager recognizes the XBee FTDI chip.

- Ensure the USB C is connected to a USB 3.0 port on your computer for XBIB-CU-TH or the XBee is sufficiently powered in custom hardware. Powering specs in manual.

- Configure the modem in XCTU:
~ First write default settings.
~ Write 'Bypass Mode' to AP
~ Write 'USB Direct' to P1 (Configs GPIO for modem USB)
~ Write '4' to DO (Enables USB modem VBUS)

- Press the reset button.

- Ensure your computer now recognizes the Qualcomm modem in device manager.

Proceed as usual.