Black screen after startup (no home screen)

I was just with the Firefox browser, looking for patterns (no piece, first... use airplane mode and not wifi) and when I clicked on the cog icon in Firefox the buggy device. He showed me a message saying that the home screen has crashed. Now the device boots (displays the logo of LG, the animated Fox, my carrier logo (Vivo, of the Brazil) and Firefox OS logo, but it goes to a blank screen (it is actually a black screen with high bar appearing, showing that it is on that plane and battery.) If I press the home button (or hold it) the phone vibrates, but nothing happens. If I pressed the power button a menu appears with: "Turn airplane MODE" (which is annoying because it is already on, but if I choose what to disable), "Silence incoming calls", "restart", "Power Off". There is the option "Cancel". Each of them works, but I don't know what to do.
Oh, I tried to bring together the power, them increase the volume and the buttons on the home screen when the phone is off, but nothing happens. It turns when I release the home button. In addition, the volume and lock (or power) buttons works and change the volume / locks the phone...
What should I do?

The phone is a LG Fireweb, bought in the Brazil.

Update, I tried to discount backwards, looks like you need the power, the House hold and volume KEYS until the LG screen appears, then release them. Worked well after the reset (so far).

Tags: Firefox OS

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