Hi, I just try it and not there are other ttyUSB* only this: crw-rw-rw- 1 root plugdev 188, 0 de gen. 29 23:17 /dev/ttyUSB0 About dmesg udevadmn I don't know how to do it. Only this: $ sudo dmesg | grep ttyUSB+ [ 4.307911] usb 1-1.4: cp210x converter now attached to ttyUSB0 I come back on same conditions for not to break nothing, now works... I hope give you enogh information. Thanks for all, PepRead More...