Held down Esc and installed libusb-win32 (v126.96.36.199) to Atreus Bootloader with Zadig.
I get the following error in Arduino:
avrdude: ser_open(): can't set com-state for "\\.\COM4"
An error occurred while uploading the sketch
I did hold down Esc when trying to install the firmware with Arduino.
I can change the keys in Chrysalis, but if I try to use Chrysalis to restore to factory defaults or update the firmware, I get that same error I showed above.
I also tried all the other drivers to Atreus Bootloader with Zadig but it does not work with them either.