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You could start by doing what panda53 has done with his/her device.
1. Uninstall ADE
2. Reset your device to factory configuration: when switching it on, hold the center key and the lower wing button pressed at the same time and then follow the instructions.
Remember to back up your content: books, dictionaries, themes, apps... since the hardware reset swipes it all. Remember as well to have it plugged to your computer or to the power supply.
3. Reinstall ADE and try to authorise it this time.
BTW, if you have firmware version 15.2 installed, you can de-authorise your Pocketbook from the device itself. In order to do that, go to "Settings" and then to "Maintenance". Select "Remove ADE authorisation".
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