[Q] Lumia 800 homescreen issue

[Maki 80]

I got new Lumia 800, my friend get it to me from germany. When I turned it on at 1st time, I saw logo of french Bouygues telecom!? Phone is workin fine, already updated to 7.8.8862.144 version, but on home screen, there are slightly visible, german (yes, german) words and ads. How can I rid my phone of that "shadow logo"? Thanks, Marko