When connected through USB, the device fails to establish a tty device.

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There could be several reasons for this issue. Here are a few steps that you can follow to troubleshoot the problem:

1. Check the USB cable: Make sure that the USB cable you are using is in good condition and is capable of data transfer.

2. Restart the device: Try restarting the device and connect it again to the computer.

3. Check the USB port: Try connecting the device to different USB ports on your computer. Also, make sure that the USB port you are using is working correctly.

4. Check the device drivers: Make sure that the device drivers are installed on your computer. You can check this by going to the Device Manager in Windows or System Information in Mac.

5. Reset the device: Try resetting the device by pressing the reset button or removing the battery (if possible).

6. Use a different cable: Try using a different USB cable to connect the device to the computer.

If none of the above steps work, you may need to contact the device manufacturer for further assistance.