Walkera 7E , not swown in DfuSe USB upgrade tool

Is windows 10.

I start the walkera witn EXT button, it shows the program update bar, approx 50% .

There is a little sound from the computer, and the "STM32DFU" in USB properties appear.

But the ugrade tool cannot see the walkera 7E .

However, the Deviation uploader 0.8.0 seem to find the "7E" in "DFU mode ( what is DFU mode?) , but the upgrade button remain greyed out after choosing the deviation-devo10-v5.0.0.dfu file.

So I am really stuck in this . Is there a driver /usb issue ??

Ok..is there a devo 7e.dfu file?

I used the uploader along with the devo 7E firmware now. The process ended successfully, it told me to format using FAT. I did. the DEVO 7E showing USB symbol in the display. Now, and it appears as a usb drive in windows. what do I do next ?

Is ok now. Copied the files to the USB connected tx and ok now