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BQ20Z655-R1: Communication error bqEVSW

Part Number: BQ20Z655-R1
Other Parts Discussed in Thread: BQEVSW, EV2400

Hi,
I was trying to flash DFI on our board while the board was powered by battery pack. But during the flashing process, I got communication error. After that the bqEVSW only shows No acknowledgement: VB_T2H_NACK. Now it cannot auto-detect the device. SBS window is blank. Reading SBS command 0D on Pro screen shows same error. But I can still measure 3.3V on REG33 and 2.5V on REG25. Is there anything I can try more or shall I assume the device is dead?

It happens every time when I try to flash without power adapter connected on the PACK± side. EV2400 and bqEVSW are fine because they work with another board.