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BQ27220: How to write GG file in BQ27220?

Part Number: BQ27220
Other Parts Discussed in Thread: BQSTUDIO

Hi,

How to write GG file in BQ27220? Below is my step.

1. click "ENTER_CFG_UPDATE", CFGUPDATE will from 0 to 1.

2. click "UNSEAL_FULL_ACCESS" [SEC1 : SEC0] will from [1 : 0] to [0 : 1]

3. Modify "Design Capacity" from 3000mAh to 20000mAh thern press enter. 

4. Click "Read All", "Design Capacity" value still is 20000mAh, it's wright.

5. Click "Export" and save GG file.

6. Open GG file by txt and modify  "Design Capacity" value from 20000 to 10000.

7.1 Click "Import" to import GG file, "Design Capacity" value from 20000 to 10000, but I Click "Read All",  "Design Capacity" value from 10000 to 20000. It's wrong.

7.2 After step 6., Click "Import" to import GG file, "Design Capacity" value from 20000 to 10000, but I Click "Write All",   "Design Capacity" value from 10000 to 20000. It's wrong. Bqstudio show this message " Value is beyond minimum value definded for parameter.:Calibration.Current.RDL Tempco" 

Before export ot.fs file, Which step is wrong? How to correct it?