Arduino GIGA not read by PC

hi, I'm trying to use Arduino GIGA but the PC can't find the device. The BOOT0 button is flashing green but when I compile the code it gives me this error "Warning: Invalid DFU suffix signature
A valid DFU suffix will be required in a future dfu-util release
Cannot open DFU device 2341:0366 found on devnum 42 (LIBUSB_ERROR_NOT_FOUND)
No DFU capable USB device available
Loading failed: Error loading: exit status 74". Has anyone had the same problem and know how to help me? Thanks

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