Thank you for your clarification.
After reviewing the serial number you provided, we can confirm that your RUT956 device was manufactured prior to the implementation of microSD card support for this model. As a result, the device does not include a microSD card slot.
We apologize for any inconvenience this caused. For more specific information regarding your order, we recommend reaching out directly to your supplier, as they may be able to provide additional details based on your original order.
Here you can find more information of when the changes were implemented: RUT956 Product Change Notifications - Teltonika Networks Wiki
Best Regards,
Justinas