Schneider M241 / SD Card Firmware Update 

1) Power Down PLC
2) Insert SD Card
3) Power Up PLC
4) Wait (about 40 seconds) until SD light turns off and ERR light Flashes.
5) Remove SD Card
6) Wait for PLC to Reset. This is indicated by Run light flashing
7) Switch RUN switch to 'stop' position.
8) Switch RUN switch to 'run' position