"This is a common occurence with ADE when new firmware's come out. What happens is that ADE see the new firmware as a new device. Its happened with firmware for the 360 and 301 and with other devices.
Simply (re) authorize the device with ADE and it will work fine.
Connect device to PC. Start ADE. When it opens, ADE should detect the new device and offer to Authorize it. If it doesnt or it hangs and it shows the 902 in the list of "shelves" then you may have to de-authorize the device first.
With ADE open press Control Shift E to open the authorization dialog box. 902 should be selected then click de-authorize. Disconnect/eject the device, close ADE, reconnect the device and re-start ADE. The 902 should show in the shelves and you should be able to add books to it.
Books that were transferred before may have to be done again. I hadn't any on the device at the time to check that.
To remove the ADE authorization, go to Configuration/Maintenance/Remove ADE authorization.
Open ADE and plug in the device. It will ask to authorize the device, click yes."
If you have any further problems in regards to this issue, simply email
service@pocketbook-usa.com or call 1-877-326-0196.