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You could throw away your USB cable. Using the JBL's USB interface for
anything besides messing with the built-in user data memory, is a bad idea.
To be safe, you should use a blank SD chip formatted to FAT16, for updates.
(I have used FAT32 formatted SD chips for updating with no problems, but it
is easy enough to do a quick re-format to FAT16.) You should use FAT32 for
your ebook SD(s) though.
It is also very unlikely that you could not just reset and re-flash properly to
recover from a bad flash with any ARM based device. At the most you would
just remove the batteries and hold the reset, to thoroughly discharge the JBL
and then start over.
Luck;
Ken
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