Unhappy [Q] android tv problem,help!!

hey guys, i bought mk808b(r-box) android tv dongle few months ago.
Since last week, when i on the android tv. it shows me a rainbow like screen like a laptop monitor broken screen. i have attach link of the screenshot of my tv


I have try change the dongle to another hdmi port but still give same result.
Is it possible that the ROM is corrupt? if yes, how to fix it?