MI BOX 4K (mdz-16-ab) black screen after loading android - Android Stick & Console Computers General

Hi,
My Mi Box doesn't work from yesterday. It starts, shows the screen with logos, then colored circles and logo android. After that i have black screen and for few seconds appears text like "android update" and nothing happens, screen is still black. Mi remote is working, display volume indicators, also displays "turn off screen" while holding power button.
My android version is 8.0 and i can't go into recovery mode with holding back and OK buttons wile pluging power cable. Can you help ?

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