Hey Guys. I can't flash my re:load pro to version 1.11. (current 1.10)

dev@ubuntu ~/Downloads> python -m cyflash --serial /dev/ttyUSB0 "Reload Pro v1.11.cyacd"
Initialising bootloader.
Timed out waiting for Bootloader response.

The device ins unresponsive to serial messages but works properly when operated manually.

Any hint?

Thanks