The flash always appears to be successful, without any error messages.
Sometimes the only thing that works for me (and has also been the answer for some others) is downloading a new copy of the ROM file and reformatting the external SD card before placing the files on it.
I think sometimes the problem is related to a ROM file that was corrupted either during download or during transfer to the SD card. Other times, it is caused by bad blocks in the internal NAND, which just don't get written accurately.
In either case, the only solution is to try again until it works correctly.
ShaunMT
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