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A quick note about upgrading the firmware and Adobe Digital Editions authorization. Before installing the new firmware I had de-authorized my Pocketbook (Ctrl+Shift+E in Windows, Cmd+Shift+E in Mac - for those interested) and then reauthorized it after upgrading the firmware. However, this is not sufficient. At first I was unable to open any DRM'd epubs on the Pocketbook. After a bit of investigation, I realized that there is a file tucked away in the root directory of the device - /Pocket301/.adobe-digital-editions/device.xml - that is not modified by the firmware upgrade leading to a mismatch between the identity of the device as reported in this file and the expected identity for the ADE authorization.
The solution:
1.) Deauthorize the device.
2.) Delete the directory /Pocket301/.adobe-digital-editions/
3.) Unmount and remount the device (Not sure if this is necessary, but it couldn't hurt)
4.) Re-authorize the device. This should recreate the directory and, more importantly, the file device.xml with the correct firmware information and device identity.
5.) Enjoy reading your fancy DRM'd files.
I hope that this is helpful to some folks.
Cheers.
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