cann’t update firmware my new atf nitro / lighting

My new atf doesn’t work ..
start log

Please update your Box Firmware
==============================================
* Follow these Instructions
1. Disconnect any phones connected to ATF Box
2. Go to "Product Support Tab"
3. Go to "Box Tools" Section
4. Click "Update Firmware" button

* Make sure you put ATF Software in Windows
FireWall Exclusion List

* Make sure you put ATF Software in your
Virus Scanner Exclusion List

================================================
Box Successfully Initialized

can not update … update log is
" error server connection "

then I post my s/n here

My box SN:F6B547A0