f you’ve already downloaded the ROM again, and continue to get the error, there is an easy solution. Note, we only recommend this solution if you’re quite sure it’s not a true checksum error. We have direct experience with using this solution multiple times, and so far we’ve never had an issue.
It is a very simple solution to the question of “how to fix image checksum fail!” in SP Flash Tool. Simply delete the ‘checksum.ini’ file in the ROM folder.