Siemens SINAMICS G120 Operating Instructions Manual page 361

7. Remove the card with the firmware from the inverter.
8. Switch off the inverter power supply.
9. Wait until all LEDs on the inverter are dark.
10.Switch on the inverter power supply.
11.If the firmware downgrade was successful, after several seconds the inverter LED RDY
12.Transfer your settings from your data backup to the inverter.
You have downgraded the firmware of the inverter to an older version and have transferred
the backed up settings into the inverter.
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
turns green.
After the firmware has been downgraded, the inverter has been reset to the factory
settings.
See also Section: Backing up data and series commissioning (Page 323).
Corrective maintenance
10.10 Firmware downgrade
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