If you own the Camon C8, great news! There is now an official marshmallow update from Tecno Mobile. The update information was released on the official Tecno Mobile forum and it is quite easy to install. You can head over to the forum, by clicking here to see how to update your device.
Although you might need to download the update file which is 868MB in size from HERE and currently the dropbox link is inactive, but will update this article once it is active.
Definitely a great news, by the way, this update will also bring in the much talked about HiOS.