Multiplus shows Low Battery warning and won't turn on.

I knew, the test would be tight and I may run out of battery during the night. I had only 41% state of charge and still let the load of 2kW running over night. In theory (and what the smart shunt calculated), it should be possible. So, I gave it a shot... and lost. But not as expected....
And now, the Multiplus is in some sort of deadlock and won't start anymore after it shut down in the morning.
I'm investigating and troubleshooting with not much luck. I cannot figure out what exactly happened and why the Multiplus is locked...

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