I've not been here for a while but I bought and set up my new Kobo Aura One
yeaterday having waited weeks to find a store that had one.
There was a dark shadow around the margin area of the screen. Phoned Kobo and they advised a factory reset. This lightened the shadow but it is still there. Phoned Kobo again and was advised that I would be contacted by a higher level...... but I'm still waiting.
Has anyone had or have this problem, I can return the Kobo to the store for a refund but they don't have any more in store.