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BQ40Z50-R2: firmware program error

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQSTUDIO, , EV2400

Bqstudio 1.3.86 + Ev2400, programming bq40z50-R2 2.11 firmware board. It works fine for most samples but two reported checksum error at the end of the firmware program process.  These two samples can not be programmed anymore afterward.  No respond to 0x0d command. "Timeout or unexpected response communication with device" was the error for any SMBUS command from the BQstudio. No T-sensor pulse. 

Any way to recover this chip? or the chip is bricked and unrecoverable.