Updating from firmware version 3.20 or earlier to firmware version 4.01 or later must be done following a two-steps specific procedure. For instructions, refer to the M580 Firmware Installation Guide.

Besides, thanks for following the next recommendations if intended to upgrade the M580 controller with a firmware version 4.01 or later, as explained in Firmware History Release Notes RN0000000110.03 :

1. In case you are using a Modicon M580 RTU module in association, first upgrade the RTU module to firmware version 03.02.02 or later and test your application.
2. In case you are using a Modicon BMENOC0301 or BMENOC0311 module in association, first upgrade the BMENOC module to firmware version 02.20 or later and test your application.
3. In case you are using a Modicon BMENOC0321 module in association, first upgrade the BMENOC module to firmware version 1.09 or later and test your application.

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