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BQ34Z100-G1: BQ34z100-g1. Data flash checksum error?

Part Number: BQ34Z100-G1

Hi,

I am reading data from BQ34z100-g1 data flash with the BQ Studio. 

I have read bytes from 0x40 to 0x5F of subclass ID = 48 (=0x30). It can be seen in the image, I check that all values are as expected. 

I have also read the checksum (0x60) and the result is 0x5D.

For that checksum the 8-bit summation for the whole block data (0x40 to 0x5F) should be 0x2A (0xFF-0x2A = 0x5D)

However I have done the 8-bit summation byte by byte of the 32 bytes you can see in the image and always the result is 0x22.

1. What am I doing wrong?

2. Could you please give me an example of how to do it? 

Thankyou vey much in advance,