MEGA 2560 is functionally identical to the extremely popular and easy-to-use open source Arduino MEGA2560. The defect is on pin 51, which is not connected to the microcontroller due to the manufacturing error. As this is also the MOSI pin, SPI will not function - the workaround is to connect MOSI pin on ICSP header (see the image). Also, shields that use this pin will not work correctly.
ID: 12681
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