If you are the owner of Letv Le 2 X620 that comes with mediatek MT6797 processor and want to download its usb drivers here are the drivers pack for it. This drivers pack includes usb adb mtp preloader vcom and cdc drivers.
Download Letv Le 2 X620 MT6797 USB ADB MTP Preloader Vcom CDC Drivers
Supported with : Windows xp , windows 7 , windows 8 and windows 10 both 32bit and 64bit.