https://devzone.nordicsemi.com/f/nordic-q-a/60855/pc-nrfutil-libusb-bunled-and-usb-serial-option1. Why is `libusb-1.0.dll` bundled for MacOS and Windows? Note: I&#39;m not question this, just want to learn why. Are they not installed by pip if listed as a requirement? 2. If I understand it correctly, command `dfu usb-serial` is identical to `dfu serialen-USTelligent Community 13Mon, 04 May 2020 06:52:33 GMThttps://devzone.nordicsemi.com/thread/247766?ContentTypeID=1Mon, 04 May 2020 06:52:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b6d64b2-3509-476b-aff8-744cce8b27f3Einar Thorsrud<p>Hi,</p> <p>1. libusb-1.0 is included to support the special «trigger interface» on the nRF52840 Dongle, which makes it possible to switch from application to bootloader mode on the device.</p> <p>2.&nbsp;The dfu usb-serial is dfu serial plus support for trigger interface as described above.</p><div style="clear:both;"></div>