Hi there!
SNA12K-US Product
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EG3 PowerPro Lithium battery
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12kW rating Firmware:
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ceaa-0405
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I don't believe this is a firmware issue. Significant flickering is typically related to wiring problems. I recommend checking that the neutral and ground wires are properly connected and secure, ensuring there are no loose connections.
LED lights are very sensitive to voltage especially on a dimmer switch. You may or may not have a wiring problem. My led lights do the same on dim. Put some regular light bulbs in and see if they flicker. If they do you definitely have a wiring problem probably a ground issue.