Can't Flash to Revolt OSD

[BeoQua]

Hi Guys,

i've some trouble flashing EmuFlight to My RevoltOSD.

The configurator starts and upon connecting the Revolt OSD we can see that it is in DFU mode.

However upon choosing Flash Firmware -> nothing happens and the status says "USB device successfully closed" without flashing the board.

Anyone who can help me out?

Thanks in advance!