Hi Juan, I fully agree with Gregg Levine remarks.
But, for the first look, I maybe see your mistake in GRUB "serial" command, so there is my first aid: > but when I write "serial --speed=115200 --word=8 --parity=no --stop=1 usb0" > this print it: > > "serial port 'usb0' is not found" Try "serial_usb0" instead of "usb0". BR, Ales
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