Go to device manager. Select "show hidden devices" and remove the 49 you don't need any longer
Good guess, thank you Matthias that could have worked. Unfortunately only extra RNDIS devices are visible that way (though still not deletable), hidden serial/cdc devices are not visible on mine. What about your system, I guess you also have tens?
Have you found an answer to your question? Let us know if you still need assistance.
Thank you Sergio, I just reinstalled windows and now can flash another 50 boards , but I only flashed 3 since so it is a long time till I need to reinstall again.