I want to pass my iPhone on to a friend. I backed up his old phone and restored it to the new one. After restarting it I see this:

This is the case, because I had "Find my iPhone" activated and did not deactivate it before restoring my friends backup.

I followed the instructions of Find My iPhone Activation Lock: Removing a device from a previous owner’s account and removed the phone from my account, by opening icloud.com/#find and removing it.

The problem is, I can still not activate it. Neither with my Apple ID nor with the Apple ID of my friend. I hoped that the deletion and removal from my account would just might take some minutes or even hours, but 12 hours later, the problem still exists.

Anything else I can try?