Thank you for your prompt answer knro. But my request was refused as follows. I think my setup of the system may have some problem or imperfection. pi@ras_pi1:~ $ indi_setprop "EFW.FILTER_SLOT.FILTER_SLOT_VALUE=1" connect: Connection refused pi@ras_pi1:~ $ sudo indi_setprop "EFW.FILTER_SLOT.FILTER_SLOT_VALUE=1" connect: Connection refused Best regards, TatsujiRead More...