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Linux/BQ27542-G1: fail to unseal bq27542

Part Number: BQ27542-G1
Other Parts Discussed in Thread: BQSTUDIO

Tool/software: Linux

Hello 

    the seal key is 20180101. I try to unseal bq27542 by commands write them by i2c code. fist I send 0x0101 to 0x0000 and then send  0x2018 to 0x0000, 0xffff to 0x0000, , oxffff to 0x0000.  after finish all these, read out the 0x0000, the value is 0x608b, still be sealed. Did I miss any more steps ?