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BQ28Z610-R1: Impossible to change seal key

Part Number: BQ28Z610-R1
Other Parts Discussed in Thread: BQSTUDIO, BQ34Z100


I try to change seal key with BQ Studio 1.3.111, but it doesn't work.

Here a sreen to show the different commands: 

  • The first two lines are to show that the BQ has the default codes
  • Then I want to change to have 5453 4554 for Unseal key. Thus, I write 35 00 54 45 53 54 FF FF FF FF in 0x3e
  • Then I write the checksum + length 8E C0 with cmd 60
  • Finally, I re-check the unseal key with cmd 35 00 in 0x3e.... and he has no change.

Could you help me?