I am studying d2s schema for making D2R MOD,
and found the checksum algorithm of Diablo 2 save file in the below link:
https://github.com/krisives/d2s-format#checksum
(Maybe it is correct because lot of people did cross-check about it)

and I tried to modify some byte datas in d2s file and use below code in python.
Although checksum was updated well, but failed to load this d2s file at D2R.

Is there any problem of below code?
d2s 파일 구조에 대해 잘 아시는 분이 있다면 도와주세요!