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Okay, it was my fault, I didn't flash RTE second time and it got a weird state. After flashing update one more time RTE got updated and now it is working correctly.

Hi,

I update mine OSTC4 to 1.6.5 from 1.6.0. It was a bit discharged to 2.7V, I charged it to 3.3V on old firmware, then update it.

Now it show me 0.0V and in maintenance menu code FF. What does it mean?