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BQ40Z50-R1: error code

Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50,

When we checked I2C signals between the battery and the charger, battery

answered "0x0087" as battery status.

Almost all answers from battery include "7" code.

"7" means "The Smart Battery detected an unidentifiable error."

Please advise how to solve this issue. 

The IC we use on the battery pack is BQ40Z50.

Is this issue related to pull up resistor?

Thank you.