Same problem! Phone crashes and won't boot beyond "Blackview" logo screen:
A few days ago when I woke up to its alarm, as I have been doing since I purchased it, I turned off the alarm and was greeted by a white screen informing me that "the application failed to launch". It then rebooted itself but never came out of the "Blackview" logo screen. After doing a hard reset a few times (pushing power + Up buttons) it finally booted up but it constantly did the same thing - kept rebooting and not booting all the way into the UI. I finally retrieved my data from it and was able to do a factory reset - but it did not help. The phone is not still not usable. Please return this on warranty - repair it - or sell me something else.
Please don't tell me to turn it off - It will not turn-off - just stays on "Blackview Screen".
Did you try to use the sp falashtool to install android marshmallow ?
Download the MM second version from here and flash it . It will work.