All M258/LMC058 LEDs are off at the controller power on : what can I do ?

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All M258/LMC058 LEDs are off at the controller power on :

M258 LEDs panel

You must download the firmware in the controller using the USB memory key (with compatible script file).
The firmware for Modicon M258/LMC058 Logic Controller are available on the http://www.schneider-electric.com website (in .zip format).

NOTICE

INOPERABLE EQUIPMENT

Do not interrupt the transfer of the application program or a firmware change once the transfer has begun.
If the transfer is interrupted for any reason, re-initiate the transfer.
Do not attempt to place the device (logic controller, motion controller or drive) into service until the file transfer has completed successfully.

Failure to follow these instructions can result in equipment damage.

1) Extract the zip file on the root of the USB memory key.
NOTE: The folder \sys\CMD\ contains the download script file.

2) Power OFF

3) Insert the USB memory key into the controller.

4) Power ON
NOTE: The USB Host LED is flashing green and the other controller LEDs are switched OFF during download. NOTE: All controller LEDs may be switched OFF for up to 4 minutes during the download. Do not interrupt the procedure. If your USB memory key has an integrated activity LED, this LED flashes during the procedure to indicate normal activity.

5) Wait until the end of the download (USB Host LED is solid ON):
If an error has been detected, the USB Host LED is red.
If the download ended successfully, the USB Host LED is solid green.

6) Remove the USB memory key.
The controller reboots automatically with new firmware if the download ended successfully.
NOTE: If the controller reboots with its LEDs OFF, go back to Step 2.