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Originally Posted by navman
So far instance if the first byte of the spare 5Kb of data is a 0, then if you change it to a 255, then your 255 nearer to the correct checksum..keep doing this over the 5Kb of data until the original checksum for the 30kb is reached..NavMan
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I think, that checksum calculating is not so easy
For example, checksum of 1 FF byte file is
3045181057, and checksum of 1 FE byte file is 1738016605.