Gigabyte replied with -
Answer : Dear customer,
this message just tell current bios using checksum code 2600, please continue to complete flash update.
Sounds good! You can think of a CheckSum as the computer comparing the Sum of a series of numbers (bits) to what the maker of the BIOS pre-computed this Sum to be. So it's a very simple method of making sure that all the data survived the transfer.
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