BQ40Z80: Authenticated battery private key

Hİ all,

İf we authenticate the battery(off course we send a 128 bit private key and 160 bit challange and getting same digest) and after seal it the bq studio don't  ask a  key 

I think studio take the unseal and full acces key from private key but I can't get the find the which part of private key(first 4 byte little endian, 4 last byte big endian or etc.) is unseal and full access key or if its not work like that what is unseal key and full access key. 

P.S= I read the trm of bq40z80 and How to ımplament SHA1/HMAC authentication for bq26100