Unhappy F180s connects to PC only in charging mode

I just got F180s yesterday (4.1.2).
Did an off-line update to Kitkat, after that I can only connect in charging mode.
So I try to flash it again, but no luck.
When I put it in download mode, my PC doesn't detect it.
Please help, I cannot transfer files to my phone.
There is no place like home.