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I recommend trying recovery mode first to re-install the bootloader and original firmware.If that fails, try using e200tool to get into recovery mode (I can give you Windows instructions if you want, but I recommend Linux because it is simpler and handles the USB for the Sansa better than Windows).
So, you can get into recovery mode? Is this an R series?
OK, try getting to recovery mode, putting a bootloader and firmware image, as well as a blank file named "sansa.fmt"; warning! this will format your player, but I think the problem might be a corrupted file system.
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