BQ27742-G1: "Operation failed because initial read of all data flash failed"

Hello ,
I'm asking for your help with following problem:

I have difficulties to read out or access the data flash of the bq27742-G1 with the bq management studio software.
To program chem id or write values to the data flash always ends with an error.
Im getting readings for the bit registers. But there is also some kind of problem to use "Read all" in the "Data Memory" window.
It is working just really rarely if i press that button a lot of times.

Pull ups are attached to SDA and SCL and the signals on the lines were checked and are looking fine.
Can you tell me which frequency the bq studio is using for i2c and how to adjust it? Is there some kind of other error source
what Im not thinking about?

Thank you!