that's what I did now and it all seems to work correctly, it's just that I didn't use a ready-made board with all possible interfaces already built in, but a custom design. That's why I didn't have an I2C to USB or other interface to test my code, hence the way I read out the memory, which I could easily read out via the ISP interface and stumbled across the error. Now I have returned the values via the I2C and a serial to USB converter, so it is probably due to the Microchip Studio. I have not yet been able to find any options for setting the memory size, for example.