Win 7 no connect DEVO 8s

STMA32 DFU indicated in devices. Transmitter in EXT ON mode shows USB. But, in DEFU USB upgrade program, the transmitter connection not seen. Can't upgrade. Please advise.

take the manual and fix the "enter" button. so i could see my 8s as a usb

I do not understand.
Manual says to hold EXT button and turn on TX. I get the program update screen on the TX. I get a response from the computer indicating USB connection. BUT, all I get is a new virtual comm port. I do not get a TX hard drive and I do not get the "available DFU" devices in the upgrade screen. I can put in the devo DFU upgrade firrmware program, but of course nothing happens. Got any ideas?

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To all, thanks.
The Manual explain that we MUST use only the USB driver it names,,not the ST micro electronics version. With the correct DFUSE it works fine.