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BQ40Z50-R2: 0x1717 answer from all registers.

Part Number: BQ40Z50-R2

Hello. 

Trying to start communication with BQ40Z50-R2. Faced with issue when all registers are answered with 0x1717.
I saw and tried two advices:
- Lowered baudrate from 400kHz to 40kHz
- Added delay between reading registers. So every second only one register is read. 

But still have this issue with 0x1717. Where should I go look now?