This usually indicates a baud rate mismatch (if using a Serial connection) or an incorrect driver version. Ensure you selected the exact "LK-T210" model driver and not a generic POS driver. Issue 3: Driver Fails to Install

: Supports flexible paper rolls between 50mm and 82.5mm .

If you need a specific version, let me know your (Windows 10/11) and connection method (USB/Serial).