V1397 unlock error


hello team,

am getting this error when i try to unlock V1397

onnect the phone powered off with both volume down and up pressed or connect the phone powered off and leave it connected to the usb till it shows the battery/charging screen ;
Phone detected (@usb.inf,%usb\composite.devicedesc%;USB Composite Device)
Preparing to enter download mode;
Phone detected (@usb.inf,%usb\composite.devicedesc%;USB Composite Device)
Preparing to enter download mode;
Phone detected (@usb.inf,%usb\composite.devicedesc%;USB Composite Device)

what am doing wrongly please

ras