Following steps worked for me: 0. Backup your data! 1. Download and install USB COM driver: http://bbs.blackview.hk/viewtopic.php?f=144&t=54240#p60098 2. Download and unzip Flash tool: http://bbs.blackview.hk/viewtopic.php?f=144&t=122499#p301881 3. Download and unzip ROM ver. 20170424: http:...