‑42‑
Install the TF extension card with power off.
2. Power on the PLC again.
If the RUN and ERR indicators flash quickly, it indicates that the firmware upgrade
is in progress. If the RUN and ERR indicators are OFF, it indicates that the firmware
is successfully upgraded. If the RUN and ERR indicators flash slowly, it indicates
that the firmware upgrade failed.
3. After firmware upgrade is done, power off the PLC and remove the SD card.
4. Power on the PLC again.
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