BQ78Z100: Writing flash data

I am controlling bq78z100 with my CPU using HDQ

I need to write into manufacture info block A24 (0x4058) and fail to do that.

I can read back the manufacture info block Ok.

Using bqStudio I can write this address successfully.

1. Do I need to write the entire Block? (32 bytes)

2. Do I need to calculate C.S and write it also?

According to example in the PDF file I try:

Write 0x3E|0x80 =0xBE
Write 0x58|0x80 =0xD8   //Little Endian
Write 0x40|0x80 =0xC0
Write one byte Data. (0x12)

Thanks