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The Adobe RMSDK library is what is used to produce the AdobeViewer app on the device. Most epub readers come with some kind of app based on the same library, that can be used to read epubs encrypted with ADE, and pdf files encrypted with Adobe's scheme.
I'm trying to remember if PocketBook stopped allowing older firmware versions to be installed. I'm pretty sure Sony stopped allowing that. I have both kinds of devices, and may be mixing it up in my mind. It would be good if someone who successfully installed a version 4 firmware over a version 5 firmware reported here to let us know.
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