doro 810 problem

hi ive installed the drivers i found in support but having trouble with meta mode

Selected connection metod: META Mode
Exe version: NCKDongle AndroidMTK
Selected phone: Doro 810
Scanning for presents meta ports…
Meta ports not detected, starting brom stage.
Curent Platform: MT6575
Phone must be off with battery inside.
Please insert USB cable now…
Detected(5) : PreLoader USB VCOM (Android) (COM5)
Starting META mode, wait…
Error open meta port[COM0].
Meta mode error, check if phone driver is corectly installed!
All done