*shrug* I don't generally use the stock Jinke firmwares. (One of the reasons is that the download from their web site is often glacially slow and unreliable.) That said, the most common cause for errors while updating the firmware seems to be the SD card. But since updating to another firmware seems to work for you, maybe the firmware image you have is corrupt. I suggest trying the latest BeBook firmware - it is, AFAIK, based on the 2008-12-12 Jinke firmware.
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