I contacted the technical support of Logitech on the official website, after 2 hours of torment they issued me a replacement. At least some advantage in this situation. Some pros: Everything was perfect, but after 1.5 years of operation, the letter "C" was no longer printed. With its cons: The letter "C" is not printed if you do not press clearly in the center and to the end, but on the bottom left. That is, you do not press exactly in the center, until the end of the key - but it does not work. Doesn't work at all. I type very fast and extremely blind, so I can't aim at the center. Therefore, I press the "C" key 5-6 times each time, due to the fact that it is not printed.
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