Ohh, yes. I've tried every combination I could think had a chance of working and a few that didn't. I apparently successfully upgraded to the new firmware, then turned it off to try loading an ebook onto the SD card(which I had problems with). When I tried to turn it on, it got to the first page--'CYBOOK GEN3'--and stopped. I've also tried to 'downgrade' to 538 but nothing happens.
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