Update PyBoard MicroPython firmware, run on Ubuntu 20.10.

Install dfu-util: 

Run in Terminal -

$ sudo apt install dfu-util

Download firmware:

To update MicroPython firmware, visit http://micropython.org/download/, select your board and download firmware for your board. ex. pybv11-20210308-unstable-v1.14-83-g680ce4532.dfu, latest firmware for PYBv1.1 boards.

Flash .dfu to pyboard:

Switch to the downloaded file folder.

Run the command:

$ sudo dfu-util --alt 0 -D <downloaded firmware .dfu>