File list (Check if you may need any files):
MT6589 USB VCOM drivers
.......................\2K_XP_COM
.......................\.........\MDMCPQ.INF
.......................\.........\usb2ser_2kXP.inf
.......................\.........\usb2ser_XP64.inf
.......................\.........\usbser.sys
.......................\installdrv.exe
.......................\installdrv64.exe
.......................\Vista
.......................\.....\MDMCPQ.INF
.......................\.....\usb2ser_Vista.inf
.......................\.....\usb2ser_Vista64.inf
.......................\.....\usbser.sys
.......................\Win7
.......................\....\MDMCPQ.INF
.......................\....\usb2ser_Win7.inf
.......................\....\usb2ser_Win764.inf
.......................\....\usbser.sys
Download