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BQ27621EVM-G1: Not able to perform seal function in EVM

Part Number: BQ27621EVM-G1

I am able to use SET_CFGUPDATE/SOFT_RESET/CHEM_ID to update CHEM_ID in different voltage setting. However, after sending SEALED command. CONTROL_STATUS always return 0x0294.

I expected SS bit will be set to 1 after sending SEALED command. Is there any suggestion or sample for do it.

The CMD sequence I use:
1. Check CONTROL_STATUS. Unseal it if SS is 1. However, SS is always 0.
3. Wait CFGUPD of Flags become 1
4. Update CHEM_ID
6. Wait CFGUPD of Flags become 0
8 Check CONTROL_STATUS. SS is still 0

And then I check the seal function on BQ27621EVM-G1 with battery management studio. 

The test result is in transaction log of screen shot. The result of CONTROL_STATUS doesn't change. I expect it change to 0x2XXX after sealing

It always stay at 0x0284. Just like the test result I test it on my target board.