Default No USB connection in Downloadmode

Hello!

So, i downgraded my G2 to 4.2.2 (thru the current flashing method from this thread). It worked, but now i want to upgrade to 4.4.2 .kdz again with this tool, but i cant get a USB connection in download mode.

I already installed and re-installed the drivers (from the thread), but still no luck.

The phone is booting fine and i can boot into TWRP aswell, i just cant get a USB connection in downloadmode.

At the device manager theres something like "CDC Serial port"?! cant be installed.

Any clues?