Panasonic ELC500 User Manual page 160

5) The confirmation window is displayed.
Confirm that RUN and STOP/PROG. LED are flashing and click [OK].
6) It starts updating the firmware. Do not turn off the power.
7) When it completes updating, ELC500 will be restarted automatically.
Confirm that error LED isn't lit, click [OK].
Note
-Do not turn off ELC500 during updating the firmware.
-Do not rename the firmware that is downloaded from our website.
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ELC500 Control unit