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Can anybody advise me if I can flash original firmware back without somebody noticing?
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Unless you bought the hardware in China with Duokan pre-installed, the original Kindle firmware is still there and doesn't need to be "flashed back." Just use the Duokan uninstall utility and delete the dk_ folders from the user mounted filesystem. Then maybe a Factory Reset. There may be a few stray files left laying around, but I don't think it's anything to be overly paranoid about.