What is the firmware requirement for using 140CRA31908 with M580 CPU.

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The minimum firmware version of the M580 to manage this new module is firmware version 2.30. This firmware will be available for download on schneider-electric.com.
On the S908 CRP and CRA side, there is no need to update the firmware, but it is recommended to do so in order to benefit from the latest quality ones, prior to the modernization to the M580