Serial can't find my devices

[pacman]

Could you send the output of the command lsusb when the devices are detected and again when they are not?

Hi Sailoog, accept my apologies for my late answer, but i was sailing in places with no connectivity.
It is weird, I am not able to reproduce anymore the issue, it seems that currently everything is fine; I cannot understand why now is working.
I have also tried to flash a completely new card and this time no issues with the serial finding the devices.
I will keep testing and in case update this thread.

Thank you so much