mcu not connecting

i re wrote my post as it as been deleted ...
i was having problem to connect and flash an octopus v.11 and after much testing with the great help of @Helge Keck (many thx again) to diagnostic the problem it seems that the octopus not responding was a problem of the board.
i reopen the post as i have development on the matter: thinking that the board was bad and waiting for another one i tried to put the pi4 on an ender 3v2 with an v4.2.7 board...
trying to install klipper i runned in some problem: mcu not connecting maybe another bad board i tried a third one and same so maybe the problem came from the pi:
the problem came from when ssh into the pi looking for " ls /dev/serial/by-id/" following the procedure >>> https://www.klipper3d.org/Installation.html
never the pi responded the correct answer but when trying "ls /dev/serial/
/*" the pi found a connection and when swaping this answer into printer.cfg i go the bord to respond and connect: every thing was running fine.
so my question is how knowing that could we try to make ratos work on the octopus or should i just go and run basic klipper
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