This indicates a command mismatch. Install the Generic / ESC/POS driver instead. Also, ensure your POS software (e.g., Loyverse, Square, OpenBravo) is set to “ESC/POS” mode.
The installer will ask how the Rpp 325 is connected: Rio Rpp 325 Printer Driver Download
The driver usually comes as a .zip file. Right-click and select Extract All to a folder on your Desktop. This indicates a command mismatch