The description of the steps means to me that you are not aware that in 'normal' operation, when the device communicates with the PC, you need a driver called VCP.
When you are in so-called DFU (device firmware upgrade) mode, you need another driver, which is automatically installed by the program when DfuSe is installed for the first time. Now we just need the dfu driver.
If for some reason this does not happen, or you have installed something and the PC accepts it - but you still cannot connect. Then you need the help of USBDeview. (search google: www.nirsoft.net)
This small program without installation shows you which USB device you have connected since the installation of your operating system. Shows the drivers. You can delete what may cause the collision with the right mouse button pointing to the row.
If several USB devices are connected, they are marked with a green line. Choose which one could be at fault. Be careful not to delete the necessary device from the queue.
After deleting, remove the device (which is in DFU mode) and you will find the win10 driver in the driver folder at the DefuSE installation location. Install this driver. Plug in the device that is still in DFU mode. USBDeview shows it in green. After that, the DefUSE demo will already see the device in dfu mode.
If you accidentally uploaded an incorrect or incorrect dfu file, the device will remain in dfu mode. If you can't login in normal mode, then don't panic either, just find the working dfu file and repeat the installation. After the installation, the device will log in normally by restarting (off - on).
I was long, if something is not clear, please ask or read on my website.
--
Gyula HA3HZ ( )
HA3HZ