This usually means the Baud Rate is incorrect or you are using the wrong driver (e.g., trying to use an 80mm driver for a 58mm printer). Reinstall using the "POS-58" setting.
During installation, the software will ask for the "Printer Interface." Select if connected via cable. If using Bluetooth, you will need to identify which COM Port Windows assigned to the printer (found in Device Manager). Step 4: Choose Series Mpt-ii Driver Download
Finding the official driver can be tricky because these printers are manufactured by various OEMs (Original Equipment Manufacturers). Here are the most reliable sources: This usually means the Baud Rate is incorrect