Hello,
I have two axoloti boards. One of them is working without problems, the other one is not recognized by windows. When I plugged it in the first time, a firmware update request is showing up and I did it, but since then, it is not recognized anymore. I think I bricked it 
k, dont panic ....
updating the firmware really cant 'brick' the unit, and the cases of boards failures has been extremely low
(the firmware is stored in a section of memory which can be updated again easily)
are there any LEDs lit on the board? are there any devices shown in windows related to the Axoloti board?
first solution attempt is:
(when you do the above, you can check to see when you put the board into DFU mode, can you see the axoloti board, again as described in the guide)