Help with bricked N4

2 days ago my N4 freezed, so I decided to reboot it. But after turning off it stoped showing any signs of work. No reaction on Turn on button and connecting it to the wall charger. If I connect the phone to the PC it appears in device manager as unknown qhusb_dload device. I found solution on YouTube, It says: hold Vol Down and Turn On buttons while phone connected to the wall charger and led should start blinking, but in my case It only blink once and nothing happens. Any help?

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