This from the questions at the bottom of the page for this phone http://www.doogeemobile.com/doogee-x6-pro.html
I find it unbelievable that they don't have a manual
From jason davies at 2/23/2016 1:38 PM
where can i download a manual for DOOGEE X6 Pro 5.5" HD Android 5.1 2GB+16GB Quad Core Dual SIM 4G LTE
Thank you for your mail. Sorry, DOOGEE has not released X6 Pro User Manual
If you have any question, please do not hesitate to contact us.
We will do our best to supply you better products and services!
Thanks, Best regards!