When the machine's firmware experiences an issue, such as employing the D1 Pro's firmware on the D1, it may result in a failed USB connection.

If the firmware mismatches the device model, besides the connection failure, you may observe the following occurrences:

• The motor gets locked upon machine startup.
• The LED light on the main control board remains operational, while the indicator light on the machine stays off.

What to do

1. In case of a firmware issue leading to a connection failure, you may follow this guide to enforce a firmware update and restart both the machine and software to check if the issue persists.
2. Once you have connected the machine to the XCS, you can verify whether the firmware matches the machine model or not.

Steps to verify firmware:

1. Click the icon on the top right corner;
2. Go to "Firmware version".
3. As highlighted in yellow in the picture, check the starting part of the version number to see if the version matches your machine model.
4. The expected starting part of the version number for the D series devices is as follows:

• For D1: V40.30;
• For D1 Pro: V40.31;
• For D1 Pro 2.0: V40.33;