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  1. My CPU 534 14B doesn't work. Run led flash 7 times. no possible MB+ connection, ERROR code meanings: 300 EXEC not loaded or 301 EXEC Checksum. It was working well then nothing can't even communicate with it. reset power without battery, download an other firmware (EXEC) 1.11 instead of 1.16, same problems. Someone can help on that case? I'm using NXT as programming software.