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LEDs of my M258/LMC058 are off after firmware update with USB stick

If LEDs of M258/LMC058 are off after firmware update with USB stick, please read the 3 following statements:
  • When updating M258 firmware using USB key, LEDs of controller might be temporary switched off. In such a case user must not power off PLC until “USB Host” LED is back on and no more blinking. This applies to clone USB keys as well.
 
  • After updating M258 firmware with USB key, PLC might restart with no LEDs. In such a case, user should perform the FW update with same USB key again. During this second firmware update, LEDs can be off for a while, user should not power off PLC until “USB Host” LED is back on and no more blinking. This applies to clone USB keys as well.
 
  • It is not possible to directly install firmware v2.0.31.15 on M258 if the M258 current firmware is at least v2.0.31.29 or v4.0.2.8. User should first update the M258 firmware using v2.0.31.X (X between 16 and 27).
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