Validation firmware checksum
From SFPTotal Wiki
In the body of the firmware there are two checksum that define data integrity of the firmware body. In the tabs FIRMWARE DETAIL and TABLE checksum bytes have addresses 0x3F and 0x5F.
By the default, software automatically recalculates the checksum when you changed the firmware in the tables. To disable the automatic checksum verification, remove the check mark from the menu Options -> Auto set checksum.
