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BQ20Z80-V110: Dataflash checksum

Part Number: BQ20Z80-V110

How is the dataflash checksum calculated? Does it include the non-accessible portion of the dataflash. Non- accessible meaning anything which is not on the GG file.

I ask this question because we have a legacy .senc file being used in our system with Chem ID 0100.

I want to know that if the legacy .senc file which is used is the default .senc file which comes with the chip or .senc is the modified golden image.