Από το FB της Doogee
#Doogee engineers have been trying to upgrade DG550 by OTA , but after repeated experiments, they found that there are still some bugs like"Apps missing" , and they cannot come out with solutions to these bugs.
So, I uoloaded the official ROM software which needs you to upgrade DG550 to android 4.4 manually.
Once it is finished, everything will be fine!
https://drive.google.com/file/d/0B-eEVUUoOlT4bkZycWpONkQwOUk/edit?usp=sharing