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Perhaps, I am ready to answer my own question. Since I used arduino nano, it was necessary to disconnect DTR pin of CH340 from reset cerquit. For this it is necessary to desolder the capacitor between pin13 CH340 and pin 28 ATMEGA328. Maybe someone will find this information useful.

Hi guys! I have the same issue then i try to start Serial SD functions as in the Posts: 1378. PC Display shows: Monitor xx|xx| xx|xx|xx| where the "x" is an empty square box sign for an unprintable character List mode does not work. the other functions are OK. Does sombodie know what is th...