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After unrooting (no idea how - you'll probably install a stock firmware again?), unzip the archive and run "flash_reader.bat" inside "install_noroot" and wait for the process to finish.
The long run: copy the contents of "install_noroot\sdcard" to the readers internal storage (labelled READER) and boot into recovery mode. Either with 'ebook_msc.exe' or by pressing and holding HOME+MENU when powering on. Be sure to hold the keys until the (first) progress bar reaches the right end. This should start the update from internal storage.
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