Dear Sirs!
So many bad word were written about BV5000 Android 6.0 update. It was really disaster. Version 1.3 had several improvements but with still inconvenience with slow performance.
Now I would like to say that last update - V1.5_20160612 - is really big step forward. You did a good job. Phone works much better and faster. You correct most of troubles. My device is still trying to switch interface language to cell-provider defaults. But it is not a big deal.
I would like to say thank you to all you guys!