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Look back a page or two in this thread. Chances are that either you have an SD card that is too slow, or more likely, your downloaded upgrade file is corrupted. When I had this problem earlier this year, it turned out that Firefox browsers could not download the file correctly, but Internet Explorer gets an accurate copy. The exact length of the file must match the numbers given in those messages. If it doesn't, try downloading again using a different browser.
The SD upgrade procedure does work, but the file you use must be accurate.
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