Download Doogee Hitman DG850 official firmware from the link here, and flash with SP Flash tool for quick and easy flashing.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP.
File Name: DOOGEE-Hitman-DG850-Android4.4-V06-_2015_0527.rar
Size: 433 MB
Android version: 4.4
Firmware – Download
How to flash
Once you have downloaded the firmware from above link, click here to learn how to flash.