After installation of the drum has stopped working directly with the first printing of duplex printing. Once you re-installs a different drum (also not original) Duplex is feasible again. For safety reasons, a second drum ordered (hoping error occurs only once on), unfortunately, because even after a short time no duplex printing possible.
Conclusion: Rebuilt toner has, drum probably no, even if the other Rebuilttrommel working properly ... it has also cost almost 60 euros
