Context Engine Cartridge documentation can be found [here][1] and within that information on how to download the latest device database is [here][2]

**EDIT** (Nuno)

Also check out Eric Huiza's excellent [Community Webinar][3] on this topic.


  [1]: http://docs.sdl.com/LiveContent/content/en-US/SDL%20Tridion%20full%20documentation-v1/GUID-99A3E8D8-9F7B-4AA6-B0F9-D015F2389D74
  [2]: http://docs.sdl.com/LiveContent/content/en-US/SDL%20Tridion%20full%20documentation-v1/GUID-8E5F4BCD-E975-43A1-9884-BDD73D232195
  [3]: http://webinars.julianwraith.com/2014/12/03/december-2014-webinar/