请教百达138系统修改日期校验计算

happyboyxiu

百达系统延期 后面有4位校验需要修改 请教大神如何计算

1 扇区
0 区块: 19 12 04 20 14 44 54 00 00 00 00 00 00 00 1A B2
1 区块: 00 00 00 00 00 08 00 00 00 00 00 00 00 00 00 01
2 区块: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3 区块: 01 38 89 34 38 91 FF 07 80 69 01 38 89 34 38 91