BQ40Z50-R1: BQ40Z50 - Writing/Reading 0x44 block command does not seem to match documentation

First the PEC is off.  My SBS Config. register reads: 0x20.

On the documentation, it says that in order to write/read ManufacturerBlockAccess() block 0x44,

the format is : [0x44][cmd][cmd] then read back 2 bytes from register 0x44.

But from looking at the scope, what I saw is there is an extra command: [0x02] in front of the actual command.

For example, trying to read Chem ID, the command is 0006.  Based on documentation, the SMB stream should be: 0x44, 0x06, 0x00.

But actually there is a 0x02 right after 0x44.  So the actual command send should BE: 0x44, 0x02, 0x06, 0x00.

What I don't know is that where does the 0x02 come from and do I need it for ALL THE BLOCK ACCESS commands?

When reading back, I found out that I have to read back 5 bytes and not 4bytes, I would discard the first byte and read

the last four bytes only.  For example, for CHem ID, what I read back is 0x04, 0x06, 0x00, 0x21, 0x01.  I have the PEC

turned off I am not sure why I see 0x04 there.

Also the 0x04 is different depends on what is being read back.

Could you confirm this?

Thanks.