That's always better to use the latest drivers but anyway the old one is perfectly compatible with Win10 x64. It might have a compatibility issue with the MT6755 Soc or you just had a bad USB connection temporarily. It will be investigated later.
rotarda replied at 2016-6-23 15:54
Flashing went OK, but in Recovery there is a menu with 6 options only in Chinese. How can I know whi ...
That's the factory mode, not the recovery. You can boot into the bootloader by powering on your phone while pressing the volume-up button, then you can move in the menu with the vol-up button and select recovery with the vol-down button.
What does the new USB 3 port means at you? Please use directly a USB port of the motherboard of your PC. If you have USB 2.0 ports, use a such one instead.