Android back key problem

I try to use

cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
cc.systemEvent.on(cc.SystemEvent.EventType.KEY_UP, this.onKeyUp, this);

but I do not receive any events when press BACK BUTTON on android. I use Cocos Creator 2.4.3, type script project. Also I have found this:

without any solutions. Is there any updates of this issue?

@druzenko Can you provide a demo that reproduces the problem?

Yes, there is almost empty project with this issue